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 A327331 #26 Dec 03 2019 07:16:06 %S A327331 1,2,4,4,4,8,10,8,4,8,10,12,14,22,22,16,4,8,10,12,14,22,22,20,14,24, %T A327331 28,34,42,60,48,36,4,8,10,12,14,22,22,20,14,24,28,34,42,60,48,40,18, %U A327331 28,34,46,50,58,50,48,40,68,76,84,108,156,100,76,4,8,10,12,14,22,22,20,14,24,28,34,42,60,48,40 %N A327331 Number of elements added at n-th stage to the toothpick structure of A327330. %C A327331 The word of this cellular automaton is "ab". %C A327331 The structure of the irregular triangle is as shown below: %C A327331 a,b; %C A327331 a,b; %C A327331 a,b,a,b; %C A327331 a,b,a,b,a,b,a,b; %C A327331 a,b,a,b,a,b,a,b,a,b,a,b,a,b,a,b; %C A327331 ... %C A327331 Row lengths are the terms of A011782 multiplied by 2, also the column 2 of A296612. %C A327331 Columns "a" contain numbers of I-toothpicks. %C A327331 Columns "b" contain numbers of V-toothpicks. %C A327331 For further information about the word of cellular automata see A296612. %e A327331 Triangle begins: %e A327331 1,2; %e A327331 4,4; %e A327331 4,8,10,8; %e A327331 4,8,10,12,14,22,22,16; %e A327331 4,8,10,12,14,22,22,20,14,24,28,34,42,60,48,36; %e A327331 4,8,10,12,14,22,22,20,14,24,28,34,42,60,48,40,18,28,34,46,50,58,50,48,40,68,... %Y A327331 First differences of A327330. %Y A327331 Column 1 gives A123932. %Y A327331 First differs from A231348 at a(11). %Y A327331 Cf. A011782, A139250, A139251, A160120, A160121, A161206, A161207, A296612, A323641, A323642, A323649, A327333 (similar triangle). %Y A327331 For other hybrid cellular automata, see A194271, A194701, A220501, A289841, A290221, A294021, A294963, A294981, A299771, A323647, A323651. %K A327331 nonn,tabf %O A327331 1,2 %A A327331 _Omar E. Pol_, Sep 01 2019