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A179264 Number of permutations of 1..n with sum (i-p(i))^2 <= (n+1)*n/2. 1
1, 2, 5, 13, 41, 151, 672, 3047, 13796, 70702, 406241, 2306597, 13050503, 81009240, 546463298, 3646507024, 24169492053, 172363021094, 1313445510576, 9904229155933, 74120163086669 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..21.

CROSSREFS

Cf. A179266.

Sequence in context: A247981 A149868 A007269 * A096724 A088553 A262934

Adjacent sequences:  A179261 A179262 A179263 * A179265 A179266 A179267

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 06 2010

STATUS

approved

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Last modified October 15 07:56 EDT 2019. Contains 328026 sequences. (Running on oeis4.)