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 A001010 Number of symmetric foldings of a strip of n stamps. (Formerly M0323 N0120) 4
 1, 2, 2, 4, 6, 8, 18, 20, 56, 48, 178, 132, 574, 348, 1870, 1008, 6144, 2812, 20314, 8420, 67534, 24396, 225472, 74756, 755672, 222556, 2540406, 693692, 8564622, 2107748, 28941258, 6656376, 98011464, 20548932 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS R. Dickau, Symmetric Stamp Foldings R. Dickau, Symmetric Stamp Foldings [Cached copy, pdf format, with permission] J. E. Koehler, Folding a strip of stamps, J. Combin. Theory, 5 (1968), 135-152. J. E. Koehler, Folding a strip of stamps, J. Combin. Theory, 5 (1968), 135-152. [Annotated, corrected, scanned copy] Frank Ruskey, Information on Stamp Foldings Eric Weisstein's World of Mathematics, Stamp Folding. FORMULA a(2n) = 2*A000682(n+2), a(2n+1) = 2*A007822(n). - Sean A. Irvine, Mar 18 2013 CROSSREFS Cf. A007822, A000682. Sequence in context: A216214 A269298 A153964 * A091966 A231187 A055529 Adjacent sequences:  A001007 A001008 A001009 * A001011 A001012 A001013 KEYWORD nonn,nice AUTHOR STATUS approved

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Last modified September 22 18:50 EDT 2018. Contains 315270 sequences. (Running on oeis4.)