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A051529 INVERT transform of A000081 = [1, 1, 1, 2, 4, 9, 20, 48, 115, 286,...]. 1
1, 2, 4, 9, 21, 51, 126, 318, 812, 2100, 5482, 14438, 38303, 102302, 274824, 742210, 2013941, 5488239, 15014376, 41221775, 113542455, 313681756, 868994723, 2413526848, 6719132105, 18746838609, 52412080624, 146812972155, 411977724704, 1158006098132 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..650

MAPLE

with(numtheory): b:= proc(n) option remember; local d, j; `if`(n<=1, 1, (add(add(d*b(d), d=divisors(j)) *b(n-j), j=1..n-1))/ (n-1)) end: a:= proc(n) option remember; local i; `if`(n<1, 1, add(a(n-i) *b(i-1), i=1..n+1)) end: seq(a(n), n=0..30);  # Alois P. Heinz, Apr 01 2009

CROSSREFS

Cf. A000107.

Sequence in context: A176334 A257386 A048285 * A230554 A005207 A257519

Adjacent sequences:  A051526 A051527 A051528 * A051530 A051531 A051532

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified April 6 11:51 EDT 2020. Contains 333273 sequences. (Running on oeis4.)