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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
OFFSET
1,2
CROSSREFS
Cf. A179266.
Sequence in context: A149868 A343175 A007269 * A096724 A088553 A262934
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 06 2010
STATUS
approved