

A220501


Number of toothpicks or Dtoothpicks added at nth 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
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OFFSET

0,3


COMMENTS

Essentially the first differences of A220500.


LINKS

Table of n, a(n) for n=0..66.
David Applegate, The movie version
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
Index entries for sequences related to toothpick sequences


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



