A231349 Number of triangles added at n-th stage to the structure of A231348.

1, 2, 4, 4, 4, 8, 10, 8, 4, 8, 12, 16, 10, 20, 22, 16, 4, 8, 12, 16, 12, 24, 28, 32, 10, 20, 28, 40, 22, 44, 46, 32, 4, 8, 12, 16, 12, 24, 28, 32, 12, 24, 32, 48, 28, 56, 60, 64, 10, 20, 28, 40, 28, 56, 64, 80, 22, 44, 60, 88, 46, 92, 94, 64

Offset

1,2

Comments

First differences of A231348.

Observation: the row sums of the first seven rows coincide with the first seven elements of A199923.

Is A199923 the row sums of this triangle?

Links

Table of n, a(n) for n=1..64.

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 A011782 the sequence begins:
1;
2;
4,4;
4,8,10,8;
4,8,12,16,10,20,22,16;
4,8,12,16,12,24,28,32,10,20,28,40,22,44,46,32;
4,8,12,16,12,24,28,32,12,24,32,48,28,56,60,64,10,20,28,40, 28,56,64,80,22,44,60,88,46,92,94,64;

Crossrefs

Right border gives A000079.

Cf. A001316, A011782, A231348.

Sequence in context: A076340 A076345 A327331 * A170893 A194445 A220525

Adjacent sequences: A231346 A231347 A231348 * A231350 A231351 A231352

Keyword

nonn,tabf

Author

Omar E. Pol, Dec 15 2013

Status

approved