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A322145
Number of permutations of 9 copies of 1..n with no element equal to another within a distance of 1.
2
1, 0, 2, 17236524, 2511603532825176, 2829059722872229922701920, 17498057808683351584656839871450000, 459422439054082909311010463927575656038701920, 42176005899746902650961357272521722186133207293858938240
OFFSET
0,3
LINKS
FORMULA
a(n) = n! * A321669(n).
a(n) = Integral_{0..infinity} (Sum_{k=1..9} (-1)^(9-k) * binomial(8, 9-k) * x^k/k!)^n * exp(-x) dx.
CROSSREFS
Row 9 of A322093.
Sequence in context: A326615 A259407 A157992 * A301810 A296627 A247214
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Nov 28 2018
STATUS
approved