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 A073429 #15 Jun 29 2020 20:42:01 %S A073429 1,0,1,0,0,2,0,0,1,4,0,0,0,6,8,0,0,0,6,20,16,0,0,0,4,40,56,32,0,0,0,1, %T A073429 68,152,144,64,0,0,0,0,94,376,480,352,128,0,0,0,0,114,844,1440,1376, %U A073429 832,256,0,0,0,0,116,1744,4056,4736,3712,1920,512,0,0,0,0,94,3340,10856,15248,14272,9600,4352,1024 %N A073429 Upper triangular region of the table A073345. %H A073429 Alois P. Heinz, <a href="/A073429/b073429.txt">Rows n = 0..200, flattened</a> %H A073429 FindStat - Combinatorial Statistic Finder, <a href="http://www.findstat.org/StatisticsDatabase/St000050">The depth of the binary tree.</a> %e A073429 Triangle T(n,k) begins: %e A073429 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ... %e A073429 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, ... %e A073429 2, 1, 0, 0, 0, 0, 0, 0, 0, ... %e A073429 4, 6, 6, 4, 1, 0, 0, 0, ... %e A073429 8, 20, 40, 68, 94, 114, 116, ... %e A073429 16, 56, 152, 376, 844, 1744, ... %e A073429 32, 144, 480, 1440, 4056, ... %e A073429 64, 352, 1376, 4736, ... %e A073429 128, 832, 3712, ... %e A073429 256, 1920, ... %e A073429 512, ... %e A073429 ... %p A073429 A073429 := n -> A073345bi(A003056(n), A002262(n)); %p A073429 A002262 := n -> n - binomial(floor((1/2)+sqrt(2*(1+n))),2); %p A073429 A003056 := n -> floor(sqrt(2*(1+n))-(1/2)); %K A073429 nonn,tabl %O A073429 0,6 %A A073429 _Antti Karttunen_, Jul 31 2002