A151655 Number of permutations of 6 indistinguishable copies of 1..n with exactly 6 adjacent element pairs in decreasing order.

0, 1, 5703096, 66555527346, 192698692565176, 316974599311624359, 397768872682646100636, 434043806185138225218436, 439395848635147188368481612, 426929358472916282151832375761, 405535686731345325826890883972000, 380430912675288777613784486729018310

Offset

1,3

Links

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

Index entries for linear recurrences with constant coefficients, signature (3003, -3786300, 2682024198, -1201864914243, 363404029293333, -77161011499803210, 11815176548149360380, -1329158779656248955015, 111309488573704522925285, -7004394451533711514550520, 333373338418730167713194550, -12052968983433090157214600565, 331837044779855430240638028795, -6962501444742670295905526272770, 111258820356797446462202396283240, -1351514454383997891678186449039520, 12441863576084489874034981639919280, -86400749551919732280723951784162720, 449615621468636777315379208600296960, -1737983801386696776678864384637929984, 4938249787156503974586235038036959232, -10198678551925813823665615980013240320, 15129400679321667476301700714578051072, -15863940181654549420963974173350428672, 11439048602497051712704955915223171072, -5388341550257906862980346825576284160, 1491958732108657007719279670958489600, -184123553326797611274256653484032000).

Crossrefs

Column k=6 of A237252.

Sequence in context: A210353 A205045 A139064 * A283445 A234256 A258680

Adjacent sequences: A151652 A151653 A151654 * A151656 A151657 A151658

Keyword

nonn

Author

R. H. Hardin, May 29 2009

Extensions

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

Status

approved