A001417 -id:A001417 - cp's OEIS frontend

1, 8, 1368, 300608, 186086600, 123912532224, 129950723279272

Offset: 1

			For n = 2 the a(2) = 8 foldings of a sheet labeled 1234 in reading order are 1243, 1342, 2134, 2431, 3124, 3421, 4213, 4312.

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).

a(6)-a(7) from Sean A. Irvine, Jan 11 2018

Offset corrected by Anders Kaseorg, Nov 29 2024

1, 6, 1368, 85109616

Offset: 0

N. J. A. Sloane, Sep 21 2011

W. F. Lunnon, A map-folding problem, Math. Comp. 22 (1968), 193-199.
W. F. Lunnon, Multi-dimensional map-folding, The Computer Journal, Volume 14, Issue 1, 1971, Pages 75-80.
Index entries for sequences obtained by enumerating foldings

1, 6, 60, 1368, 15552, 201240, 2016432, 21582624, 201060768, 1944012744, 17257455960, 156760071600, 1346073913440, 11734199738820, 98420246759688

Offset: 0

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).

a(8)-a(14) from Fred Lunnon and Sean A. Irvine, Dec 26 2017

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