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A123552 G.f.: 1/(1-x-x^3+x^5). 1
1, 1, 1, 2, 3, 3, 4, 6, 7, 8, 11, 14, 16, 20, 26, 31, 37, 47, 58, 69, 85, 106, 128, 155, 192, 235, 284, 348, 428, 520, 633, 777, 949, 1154, 1411, 1727, 2104, 2566, 3139, 3832, 4671, 5706, 6972, 8504, 10378, 12679, 15477, 18883, 23058, 28157, 34361, 41942, 51216, 62519 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..53.

Index entries for linear recurrences with constant coefficients, signature (1,0,1,0,-1).

MATHEMATICA

a=b=c=d=0; Table[e=a+b+1; a=b; b=c; c=d; d=e, {n, 100}] (* Vladimir Joseph Stephan Orlovsky, Feb 26 2011*)

CROSSREFS

Number of nodes at n-th generation in A123015.

Sequence in context: A067592 A101195 A036018 * A071610 A198726 A117275

Adjacent sequences:  A123549 A123550 A123551 * A123553 A123554 A123555

KEYWORD

nonn,easy

AUTHOR

Christian G. Bower, Nov 14 2006

STATUS

approved

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Last modified March 25 07:31 EDT 2017. Contains 284047 sequences.