|
| |
|
|
A051529
|
|
INVERT transform of A000081 = [1, 1, 1, 2, 4, 9, 20, 48, 115, 286,...].
|
|
0
| |
|
|
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
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,2
|
|
|
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); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Apr 01 2009]
|
|
|
CROSSREFS
| Cf. A000107.
Sequence in context: A091600 A176334 A048285 * A005207 A094286 A094287
Adjacent sequences: A051526 A051527 A051528 * A051530 A051531 A051532
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
|
| |
|
|
