A151653 Number of permutations of 6 indistinguishable copies of 1..n with exactly 4 adjacent element pairs in decreasing order.

0, 225, 1424925, 879018750, 286691702976, 73088118705987, 16754170871028591, 3661270938396519084, 782843888360213140770, 165732454316454285337929, 34929333979527314682936729, 7346819169243119623855847994, 1543904846626825596394472048820

Offset

1,2

Links

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

Index entries for linear recurrences with constant coefficients, signature (495, -92130, 8679772, -464055534, 14968238202, -300963721632, 3837618601236, -31343715730089, 163923909672271, -542603125207206, 1117480735539672, -1416687024832576, 1073300058335232, -445720762271232, 78098756843520).

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