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Search: id:A160420
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| A160420 |
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Number of "ON" cells at nth stage in simple 2-dimensional cellular automaton whose virtual skeleton is a polyedge as the toothpick sieve of A139250 but with toothpicks of length 4. |
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+0
7
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OFFSET
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0,2
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COMMENT
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a(n) is also the number of grid points that are covered after nth stage by an polyedge as the toothpick sieve of A139250, but with toothpicks of length 4.
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CROSSREFS
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Cf. A139250, A139251, A147614, A147562, A160118, A160120, A160170, A160430.
Sequence in context: A139595 A008778 A014813 this_sequence A147411 A008580 A123326
Adjacent sequences: A160417 A160418 A160419 this_sequence A160421 A160422 A160423
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KEYWORD
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more,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), May 13 2009, May 18 2009
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