|
| |
|
|
A000136
|
|
Number of ways of folding a strip of n labeled stamps.
(Formerly M1614 N0630)
|
|
5
| |
|
|
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; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
REFERENCES
| 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.
|
|
|
LINKS
| T. D. Noe, Table of n, a(n) for n = 1..45
Eric Weisstein's World of Mathematics, Stamp Folding
Index entries for sequences obtained by enumerating foldings
|
|
|
CROSSREFS
| Equals 2n*A000560 (and so 45 terms are known).
Sequence in context: A192401 A151445 A195645 * A013989 A002841 A136509
Adjacent sequences: A000133 A000134 A000135 * A000137 A000138 A000139
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
|
| |
|
|
