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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 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

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.

Sequence in context: A014153 A001924 A079921 * A132109 A099854 A054355

Adjacent sequences:  A014165 A014166 A014167 * A014169 A014170 A014171

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 16 17:11 EST 2012. Contains 205938 sequences.