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 A220523 Number of toothpicks or D-toothpicks added at n-th stage in the structure of the D-toothpick "narrow" triangle of A220522. 7

%I

%S 0,1,2,4,4,4,4,7,8,4,4,8,12,8,8,13,16,4,4,8,12,16,16,20,24,12,8,16,28,

%T 16,16,25,32,4,4,8,12,16,16,22,32,26,20,24,40,32,40,41,48,20,8

%N Number of toothpicks or D-toothpicks added at n-th stage in the structure of the D-toothpick "narrow" triangle of A220522.

%C Essentially the first differences of A220522. First differs from A194443 at a(47).

%H N. J. A. Sloane, <a href="/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a>

%H <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a>

%e Written as an irregular triangle begins:

%e 0;

%e 1;

%e 2;

%e 4,4;

%e 4,4,7,8;

%e 4,4,8,12,8,8,13,16;

%e 4,4,8,12,16,16,20,24,12,8,16,28,16,16,25,32;

%e 4,4,8,12,16,16,22,32,26,20,24,40,32,40,41,48,20,8,...

%Y Cf. A139250, A139251, A194441, A194443, A194445, A220521, A220522.

%K nonn,more

%O 0,3

%A _Omar E. Pol_, Dec 15 2012

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Last modified January 28 22:30 EST 2020. Contains 331328 sequences. (Running on oeis4.)