OFFSET
0,3
FORMULA
a(n)=A151553(n-1), n>0. [From R. J. Mathar, Jul 07 2009]
EXAMPLE
Contribution from Omar E. Pol, Jun 09 2009: (Start)
Triangle begings:
1;
1;
2,2;
2,3,4,3;
2,3,4,4,5,7,7,4;
2,3,4,4,5,7,7,5,5,7,8,9,12,14,11,5;
2,3,4,4,5,7,7,5,5,7,8,9,12,14,11,6,5,7,8,9,12,14,12,10,12,15,17,21,26,25,16,6;
2,3,4,4,5,7,7,5,5,7,8,9,12,14,11,6,5,7,8,9,12,14,12,10,12,15,17,21,26,...
(End)
MAPLE
G := 1 + x*(1+x)*mul( 1 + x^(2^n-1) + x^(2^n), n=1..20);
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 08 2009
STATUS
approved