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A231349 Number of triangles added at n-th stage to the structure of A231348. 4
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 (list; graph; refs; listen; history; text; internal format)
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: A103228 A076340 A076345 * A170893 A194445 A220525

Adjacent sequences:  A231346 A231347 A231348 * A231350 A231351 A231352

KEYWORD

nonn,tabf

AUTHOR

Omar E. Pol, Dec 15 2013

STATUS

approved

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Last modified March 21 10:13 EDT 2019. Contains 321368 sequences. (Running on oeis4.)