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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
 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, 16, 16, 25, 32, 4, 4, 8, 12, 16, 16, 22, 32, 26, 20, 24, 40, 32, 40, 41, 48, 20, 8 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Essentially the first differences of A220522. First differs from A194443 at a(47). LINKS N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS EXAMPLE Written as an irregular triangle begins: 0; 1; 2; 4,4; 4,4,7,8; 4,4,8,12,8,8,13,16; 4,4,8,12,16,16,20,24,12,8,16,28,16,16,25,32; 4,4,8,12,16,16,22,32,26,20,24,40,32,40,41,48,20,8,... CROSSREFS Cf. A139250, A139251, A194441, A194443, A194445, A220521, A220522. Sequence in context: A008497 A220497 A194443 * A220527 A183226 A235863 Adjacent sequences:  A220520 A220521 A220522 * A220524 A220525 A220526 KEYWORD nonn,more AUTHOR Omar E. Pol, Dec 15 2012 STATUS approved

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Last modified December 14 22:42 EST 2019. Contains 329987 sequences. (Running on oeis4.)