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A177322 Number of permutations of n copies of 1..4 with all adjacent differences <= 2 in absolute value. 1
12, 660, 51240, 4635540, 457507512, 47768769048, 5188083048720, 580132098966420, 66341857216154520, 7722843117550721160, 912113857017595941072, 109025503164832356811800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n=1..35

CROSSREFS

Sequence in context: A220327 A281780 A295870 * A060612 A203307 A171105

Adjacent sequences:  A177319 A177320 A177321 * A177323 A177324 A177325

KEYWORD

nonn

AUTHOR

R. H. Hardin May 06 2010

STATUS

approved

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Last modified October 27 07:47 EDT 2021. Contains 348272 sequences. (Running on oeis4.)