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A014168
Apply partial sum operator twice to binary rooted tree numbers.
0
1, 3, 7, 14, 26, 47, 84, 149, 264, 468, 831, 1479, 2637, 4709, 8420, 15069, 26987, 48356, 86677, 155408, 278694, 499851, 896594, 1608353, 2885280, 5176183, 9286284, 16660260, 29890069, 53626053, 96211592, 172615925, 309696044, 555637311, 996891328, 1788564939
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..36.
Index entries for sequences related to rooted trees
Index entries for sequences related to trees
FORMULA
G.f.: (B(x)-x)/x(1-x)^2 where B(x) is g.f. of
A002572
.
CROSSREFS
Cf.
A002572
. Partial sums of
A014167
, not of
A173404
.
Sequence in context:
A079921
A369115
A293767
*
A132109
A317779
A099854
Adjacent sequences:
A014165
A014166
A014167
*
A014169
A014170
A014171
KEYWORD
nonn
AUTHOR
N. J. A. Sloane
STATUS
approved
