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Search: id:A122552
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A122552 a(0)=a(1)=a(2)=1, a(n)=a(n-1)+a(n-2)+2*a(n-2) for n>2. +0
3
1, 1, 1, 4, 7, 13, 28, 55, 109, 220, 439, 877, 1756, 3511, 7021, 14044, 28087, 56173, 112348, 224695, 449389, 898780, 1797559, 3595117, 7190236, 14380471, 28760941, 57521884, 115043767, 230087533, 460175068, 920350135, 1840700269, 3681400540 (list; graph; listen)
OFFSET

0,4

FORMULA

a(3*n)=2*a(3*n-1)+2, a(3*n+1)=2*a(3*n)-1, a(3*n+2)=2*a(3*n+1)-1, a(0)=1 . G.f. : (1-x^2)/(1-x-x^2-2*x^3).

CROSSREFS

Adjacent sequences: A122549 A122550 A122551 this_sequence A122553 A122554 A122555

Sequence in context: A074864 A074865 A072683 this_sequence A074862 A101064 A055675

KEYWORD

nonn

AUTHOR

Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 20 2006

EXTENSIONS

Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 01 2006

Corrected by T. D. Noe (noe(AT)sspectra.com), Nov 07 2006

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Last modified May 16 23:01 EDT 2008. Contains 139884 sequences.


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