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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
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?
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.
Sequence in context: A076340 A076345 A327331 * A170893 A194445 A220525
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Dec 15 2013
STATUS
approved