A231351 a(n) = A231349(n+1)/2.

1, 2, 2, 2, 4, 5, 4, 2, 4, 6, 8, 5, 10, 11, 8, 2, 4, 6, 8, 6, 12, 14, 16, 5, 10, 14, 20, 11, 22, 23, 16, 2, 4, 6, 8, 6, 12, 14, 16, 6, 12, 16, 24, 14, 28, 30, 32, 5, 10, 14, 20, 14, 28, 32, 40, 11, 22, 30, 44, 23, 46, 47, 32, 2, 4, 6, 8, 6, 12, 14, 16

Offset: 1

Author

Omar E. Pol, Dec 17 2013

Keywords

• nonn
• tabf

Comments

Observation: the row sums of the first six rows coincide with the first six elements of A006234.

Is A006234 the row sums of this triangle?

Examples

			Written as an irregular triangle in which row lengths is A000079 the sequence begins:
1;
2,2;
2,4,5,4;
2,4,6,8,5,10,11,8;
2,4,6,8,6,12,14,16,5,10,14,20,11,22,23,16;
2,4,6,8,6,12,14,16,6,12,16,24,14,28,30,32,5,10,14,20,14,28,32,40,11,22,30,44,23,46,47,32;
		

Links

• N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Crossrefs

Right border gives A000079.

Cf. A006234, A231348, A231349.