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A151630 Number of permutations of 2 indistinguishable copies of 1..n with exactly 8 adjacent element pairs in decreasing order. 2
0, 0, 0, 0, 1, 37257, 49258935, 19323413187, 3950966047950, 539417838175698, 56160822639510114, 4828612774471173450, 360918591663105680031, 24285778099889122541071, 1507815882167268489272385, 87937588306397361416746005, 4882223035755085016119166100 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

CROSSREFS

Column k=8 of A154283.

Sequence in context: A250882 A219363 A254564 * A252166 A151840 A250369

Adjacent sequences:  A151627 A151628 A151629 * A151631 A151632 A151633

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 29 2009

EXTENSIONS

Terms a(11) and beyond from Andrew Howroyd, May 06 2020

STATUS

approved

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Last modified August 12 12:01 EDT 2020. Contains 336439 sequences. (Running on oeis4.)