cp's OEIS Frontend

A220525 Number of toothpicks or D-toothpicks added at n-th stage to the structure of A220524.

%I A220525 #13 Apr 27 2021 11:51:12
%S A220525 0,1,2,4,4,4,8,11,8,4,8,16,24,16,20,25,16,4,8,16,24,32,36,42,44,20,24,
%T A220525 44,64,40,44,53,32,4,8,16,24,32,36,44,52,42,48,64,100,80,84,91,84,28,
%U A220525 24,48,72,92,104,124,132,54,56,100,144,88,92,109,64,4
%N A220525 Number of toothpicks or D-toothpicks added at n-th stage to the structure of A220524.
%C A220525 Essentially the first differences of A220524.
%C A220525 First differs from A194445 at a(13).
%H A220525 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 A220525 <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a>
%F A220525 a(n) = A221528(n)/4.
%e A220525 When written as an irregular triangle begins:
%e A220525 0;
%e A220525 1;
%e A220525 2;
%e A220525 4,4;
%e A220525 4,8,11,8;
%e A220525 4,8,16,24,16,20,25,16;
%e A220525 4,8,16,24,32,36,42,44,20,24,44,64,40,44,53,32;
%e A220525 4,8,16,24,32,36,44,52,42,48,64,100,80,84,91,84,28,24,48,72,92,104,124,132,54,56,100,144,88,92,109,64;
%Y A220525 Row lengths give 1 together with A011782. Right border gives 0 together with A000079.
%Y A220525 Cf. A139251, A194701, A194445, A220501, A220521, A220524, A220527.
%K A220525 nonn,tabf
%O A220525 0,3
%A A220525 _Omar E. Pol_, Mar 23 2013