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

1,2

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?

Links

Table of n, a(n) for n=1..71.

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

Example

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;

Crossrefs

Right border gives A000079.

Cf. A006234, A231348, A231349.

Sequence in context: A299204 A230141 A151680 * A024681 A240327 A308771

Adjacent sequences: A231348 A231349 A231350 * A231352 A231353 A231354

Keyword

nonn,tabf

Author

Omar E. Pol, Dec 17 2013

Status

approved