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 A222177 Number of pentagons added at n-th stage to the structure of A222176. 3
 0, 1, 2, 2, 2, 4, 6, 4, 2, 4, 8, 8, 6, 10, 14, 8, 2, 4, 8, 12, 16 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Essentially the first differences of A222176. Also number of P-toothpicks added at n-th stage to the P-toothpick structure of A222176. First differs from A152968 at a(10). LINKS N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS FORMULA a(n) = A222181(n+1)/5, n >= 1. EXAMPLE Apparently this is an irregular triangle: 0; 1; 2, 2; 2, 4, 6, 4; 2, 4, 8, 8, 6, 10, 14, 8; 2, 4, 8, 12, 16,... CROSSREFS Cf. A139251, A152968, A222173, A222176, A222180, A222181. Sequence in context: A278501 A278231 A152968 * A240433 A217637 A231515 Adjacent sequences:  A222174 A222175 A222176 * A222178 A222179 A222180 KEYWORD nonn,tabf,more AUTHOR Omar E. Pol, Mar 21 2013 STATUS approved

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Last modified October 15 22:25 EDT 2019. Contains 328038 sequences. (Running on oeis4.)