A179357 Number of permutations of 1..n with i-9<=p(i)<=i+4.

1, 2, 6, 24, 120, 600, 3000, 15000, 75000, 375000, 1776696, 8208474, 37712866, 174397531, 817232461, 3852954960, 18199500712, 85943742360, 405446385984, 1911059547264, 9001323581376, 42375227446272, 199427319607104

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n=1..400

Elizabeth Hartung, Brett Stevens, and Aaron Williams, Pyramid Schemes for Eating M&Ms: Enumeration, Generation, and Gray Codes, LIPIcs Vol. 366, 13th Int'l Conf. Fun Algor. (FUN 2026), Art. 23. See pp. 18 (Table 3), 20 (Table 5).

Crossrefs

Sequence in context: A179342 A179346 A179351 * A179364 A070946 A267385

Adjacent sequences: A179354 A179355 A179356 * A179358 A179359 A179360

Keyword

nonn

Author

R. H. Hardin, Jul 11 2010

Status

approved