A151714 When A151552 is written as a triangle the rows converge to this.

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

Offset: 0

Author

N. J. A. Sloane, Jun 08 2009

Keywords

• nonn

Examples

			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)
		

Crossrefs

Cf. A151552m A151553, A000079.

Programs

Maple

G := 1 + x*(1+x)*mul( 1 + x^(2^n-1) + x^(2^n), n=1..20);

Formula

a(n)=A151553(n-1), n>0. [From R. J. Mathar, Jul 07 2009]