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A306267 Number of permutations of [n] within distance floor(n/2) of a fixed permutation. 2
1, 1, 2, 3, 14, 31, 230, 675, 6902, 25231, 329462, 1441923, 22934774, 116914351, 2193664790, 12764590275, 276054834902, 1805409270031, 44222780245622, 321113303226243, 8787513806478134, 70146437009397871, 2121181056663291350, 18462286083671614275 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..475

FORMULA

a(n) = A306209(n,floor(n/2)).

CROSSREFS

Cf. A306209.

Shifted bisections give: A048163 (even part), A092552 (odd part).

Sequence in context: A319670 A047005 A080017 * A042551 A296149 A059188

Adjacent sequences:  A306264 A306265 A306266 * A306268 A306269 A306270

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Feb 01 2019

STATUS

approved

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Last modified December 9 13:50 EST 2019. Contains 329877 sequences. (Running on oeis4.)