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A151653 Number of permutations of 6 indistinguishable copies of 1..n with exactly 4 adjacent element pairs in decreasing order. 2
0, 225, 1424925, 879018750, 286691702976, 73088118705987, 16754170871028591, 3661270938396519084, 782843888360213140770, 165732454316454285337929, 34929333979527314682936729, 7346819169243119623855847994, 1543904846626825596394472048820 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

CROSSREFS

Column k=4 of A237252.

Sequence in context: A195277 A319944 A013757 * A077729 A077737 A068123

Adjacent sequences:  A151650 A151651 A151652 * A151654 A151655 A151656

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 29 2009

EXTENSIONS

Terms a(7) and beyond from Andrew Howroyd, May 06 2020

STATUS

approved

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Last modified January 21 14:37 EST 2022. Contains 350479 sequences. (Running on oeis4.)