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A161411
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First differences of A160410.
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10
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4, 12, 12, 36, 12, 36, 36, 108, 12, 36, 36, 108, 36, 108, 108, 324, 12, 36, 36, 108, 36, 108, 108, 324, 36, 108, 108, 324, 108, 324, 324, 972, 12, 36, 36, 108, 36, 108, 108, 324, 36, 108, 108, 324, 108, 324, 324, 972, 36, 108, 108, 324, 108, 324, 324, 972, 108, 324, 324
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The rows of the triangle in A147582 converge to this sequence.
Contribution from Omar E. Pol, Mar 28 2011 (Start):
a(n) is the number of cells turned "ON" at n-th stage of the cellular automaton of A160410.
a(n) is also the number of toothpicks added at n-th stage to the toothpick structure of A160410.
(End)
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LINKS
| David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157-191
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
O. E. Pol, Illustration of initial terms (Neighbors of the vertices) [From Omar E. Pol (info(AT)polprimos.com), Nov 17 2009]
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FORMULA
| a(n) = A048883(n-1)*4.
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EXAMPLE
| If written as a triangle:
.4;
.12;
.12,36;
.12,36,36,108;
.12,36,36,108,36,108,108,324;
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CROSSREFS
| Cf. A139250, A139251, A160413, A160415, A160417.
Cf. A000079, A048883, A147582, A160410, A160414.
Sequence in context: A005886 A096442 A195199 * A202636 A009115 A051434
Adjacent sequences: A161408 A161409 A161410 * A161412 A161413 A161414
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KEYWORD
| nonn,tabf
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), May 20 2009, Jun 13 2009, Jun 14 2009
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EXTENSIONS
| Edited by David Applegate and N. J. A. Sloane, Jul 13 2009
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