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A222177 Number of pentagons added at n-th stage to the structure of A222176. 3

%I #16 Mar 24 2013 13:51:07

%S 0,1,2,2,2,4,6,4,2,4,8,8,6,10,14,8,2,4,8,12,16

%N Number of pentagons added at n-th stage to the structure of A222176.

%C Essentially the first differences of A222176.

%C Also number of P-toothpicks added at n-th stage to the P-toothpick structure of A222176.

%C First differs from A152968 at a(10).

%H N. J. A. Sloane, <a href="/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a>

%H <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a>

%F a(n) = A222181(n+1)/5, n >= 1.

%e Apparently this is an irregular triangle:

%e 0;

%e 1;

%e 2, 2;

%e 2, 4, 6, 4;

%e 2, 4, 8, 8, 6, 10, 14, 8;

%e 2, 4, 8, 12, 16,...

%Y Cf. A139251, A152968, A222173, A222176, A222180, A222181.

%K nonn,tabf,more

%O 0,3

%A _Omar E. Pol_, Mar 21 2013

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Last modified March 19 04:26 EDT 2024. Contains 370952 sequences. (Running on oeis4.)