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%I A007822 #29 Oct 05 2025 21:55:28
%S A007822 1,1,3,9,28,89,287,935,3072,10157,33767,112736,377836,1270203,4282311,
%T A007822 14470629,49005732,166261653,565055147,1923186472,6554868916,
%U A007822 22367933148,76417819396,261335128098,894597454360,3064970675173
%N A007822 Number of symmetric foldings of 2n+1 stamps.
%H A007822 John E. Koehler, <a href="https://doi.org/10.1016/S0021-9800(68)80048-1">Folding a strip of stamps</a>, J. Combin. Theory, 5 (1968), 135-152.
%H A007822 Stéphane Legendre, <a href="/A007822/a007822.pdf">Illustration of initial terms</a>
%H A007822 Stéphane Legendre, <a href="https://doi.org/10.48550/arXiv.1302.2025">Foldings and Meanders</a>, arXiv preprint arXiv:1302.2025 [math.CO], 2013.
%H A007822 Stéphane Legendre, <a href="https://ajc.maths.uq.edu.au/pdf/58/ajc_v58_p275.pdf">Foldings and Meanders</a>, Aust. J. Comb. 58(2), 275-291, 2014.
%H A007822 W. F. Lunnon, <a href="https://doi.org/10.1090/S0025-5718-1968-0221957-8">A map-folding problem</a>, Math. Comp. 22 (1968), 193-199.
%H A007822 <a href="/index/Fo#fold">Index entries for sequences obtained by enumerating foldings</a>
%Y A007822 Cf. A001010.
%K A007822 nonn,more
%O A007822 1,3
%A A007822 _Stéphane Legendre_
%E A007822 More terms from _Stéphane Legendre_ (2013) added by _N. J. A. Sloane_, Mar 30 2013

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