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A177316 Number of permutations of n copies of 1..4 with all adjacent differences <= 1 in absolute value. 1
2, 26, 506, 11482, 284002, 7426610, 201922730, 5650739930, 161686253810, 4708709084026, 139111173397066, 4159013698117618, 125595645802182818, 3825428523179727266, 117382025506323434506, 3625185567639373456090 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n=1..31

CROSSREFS

Sequence in context: A137100 A228411 A216254 * A090247 A206601 A156211

Adjacent sequences:  A177313 A177314 A177315 * A177317 A177318 A177319

KEYWORD

nonn

AUTHOR

R. H. Hardin May 06 2010

STATUS

approved

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Last modified September 1 09:50 EDT 2014. Contains 246289 sequences.