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 A220501 Number of toothpicks or D-toothpicks added at n-th stage in the structure of A220500. 16
 0, 1, 4, 8, 16, 22, 24, 24, 36, 40, 32, 44, 64, 94, 72, 56, 76, 72, 32, 48, 80, 112, 140, 140, 140, 168, 120, 132, 168, 238, 168, 120, 156, 136, 32, 48, 80, 112, 140, 144, 164, 224, 216, 256, 272, 368, 324, 316, 280, 296, 160, 150, 232, 320, 404, 432, 408, 462, 300, 308, 376, 526, 360, 248, 316, 264, 32 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Essentially the first differences of A220500. LINKS David Applegate, The movie version N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS EXAMPLE Written as an irregular triangle the sequence begins: 0; 1; 4; 8; 16,22; 24,24,36,40; 32,44,64,94,72,56,76,72; 32,48,80,112,140... . From Omar E. Pol, May 02 2018: (Start) Also the nonzero terms can be written as an irregular triangle in which the row lengths are the terms of A011782 multiplied by 2 as shown below: 1,    4; 8,   16; 22,  24, 24, 36; 40,  32, 44, 64,  94,  72,  56,  76; 72,  32, 48, 80, 112, 140, 140, 140, 168, 120, 132, 168, 238, 168, 120, 156; 136, 32, 48, 80, 112, 140, 144, 164, 224, 216, 256, 272, 368, 324, 316, 280, ... (End) CROSSREFS Cf. A047999, A139250, A139251, A194271, A194441, A194443, A194701, A220500, A220521, A220523, A220527. Sequence in context: A312810 A194271 A194701 * A312811 A312812 A312813 Adjacent sequences:  A220498 A220499 A220500 * A220502 A220503 A220504 KEYWORD nonn,tabf AUTHOR Omar E. Pol, Dec 15 2012 EXTENSIONS Terms a(23) and beyond from David Applegate's movie version. - Omar E. Pol, May 02 2018 STATUS approved

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Last modified September 15 04:07 EDT 2019. Contains 327062 sequences. (Running on oeis4.)