This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A151914 #15 Feb 21 2023 17:47:27
%S A151914 0,4,12,20,44,52,76,100,172,180,204,228,300,324,396,468,684,692,716,
%T A151914 740,812,836,908,980,1196,1220,1292,1364,1580,1652,1868,2084,2732,
%U A151914 2740,2764,2788,2860,2884,2956,3028,3244,3268,3340,3412,3628,3700,3916,4132,4780
%N A151914 a(0)=0, a(1)=4; for n>=2, a(n) = (8/3)*(Sum_{i=1..n-1} 3^wt(i)) + 4, where wt() = A000120().
%C A151914 Also, total number of "ON" "subcells" at n-th stage in two of the four wedges of the "Ulam-Warburton" two-dimensional cellular automaton of A147562, but including the central "ON" cell. Assume that every "ON" cell contains four "subcells". - _Omar E. Pol_, Feb 22 2015
%H A151914 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 A151914 <a href="/index/Ce#cell">Index entries for sequences related to cellular automata</a>
%F A151914 a(n) = A079315(2n).
%F A151914 For n>=2, a(n) = 8*A151920(n-2) + 4.
%F A151914 a(n) = 4*A151917(n). - _Omar E. Pol_, Feb 22 2015
%Y A151914 Cf. A079315, A079317, A147562, A151917, A151920.
%K A151914 nonn,easy
%O A151914 0,2
%A A151914 _N. J. A. Sloane_, Aug 05 2009, Aug 06 2009