login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A014167 Partial sums of binary rooted tree numbers. 0
1, 2, 4, 7, 12, 21, 37, 65, 115, 204, 363, 648, 1158, 2072, 3711, 6649, 11918, 21369, 38321, 68731, 123286, 221157, 396743, 711759, 1276927, 2290903, 4110101, 7373976, 13229809 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

LINKS

Index entries for sequences related to rooted trees

FORMULA

G.f.: (B(x)-x)/x(1-x) where B(x) is g.f. of A002572.

MAPLE

v:= proc(c, d) option remember; if d<0 or c<0 then 0 elif d=c then 1 else add (v(i, d-c), i=1..2*c) fi end: a:= proc(n) option remember; if n=0 then 0 else a(n-1) +v(1, n) fi end: seq (a(n), n=1..29); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Aug 22 2008]

CROSSREFS

Cf. A002572.

Sequence in context: A100671 A189600 A005251 * A103197 A000709 A054161

Adjacent sequences:  A014164 A014165 A014166 * A014168 A014169 A014170

KEYWORD

nonn

AUTHOR

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 17 08:21 EST 2012. Contains 205998 sequences.