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Search: id:A000136
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| A000136 |
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Number of ways of folding a strip of n labeled stamps.
(Formerly M1614 N0630)
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+0
1
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| 1, 2, 6, 16, 50, 144, 462, 1392, 4536, 14060, 46310, 146376, 485914, 1557892, 5202690, 16861984, 56579196, 184940388, 622945970, 2050228360, 6927964218, 22930109884, 77692142980, 258360586368, 877395996200, 2929432171328, 9968202968958, 33396290888520, 113837957337750
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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J. E. Koehler, Folding a strip of stamps, J. Combin. Theory, 5 (1968), 135-152.
W. F. Lunnon, A map-folding problem, Math. Comp. 22 (1968), 193-199.
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).
M. B. Wells, Elements of Combinatorial Computing. Pergamon, Oxford, 1971, p. 238.
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LINKS
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Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Index entries for sequences obtained by enumerating foldings
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CROSSREFS
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Equals 2n*A000560.
Sequence in context: A052890 A052814 A151445 this_sequence A013989 A002841 A136509
Adjacent sequences: A000133 A000134 A000135 this_sequence A000137 A000138 A000139
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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