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 A303810 #15 Jan 21 2019 12:20:49 %S A303810 1,1,1,1,0,2,1,0,1,3,1,0,0,1,5,1,0,0,1,2,7,1,0,0,0,1,2,11,1,0,0,0,1,1, %T A303810 4,15,1,0,0,0,0,1,2,4,22,1,0,0,0,0,1,1,2,7,30,1,0,0,0,0,0,1,1,3,8,42, %U A303810 1,0,0,0,0,0,1,1,2,4,12,56,1,0,0,0,0,0,0,1,1,2,5,14,77,1,0,0,0,0,0,0,1,1,1,3 %N A303810 Mirror image of the triangle A026794. %e A303810 Triangle begins: %e A303810 1; %e A303810 1, 1; %e A303810 1, 0, 2; %e A303810 1, 0, 1, 3; %e A303810 1, 0, 0, 1, 5; %e A303810 1, 0, 0, 1, 2, 7; %e A303810 1, 0, 0, 0, 1, 2, 11; %e A303810 1, 0, 0, 0, 1, 1, 4, 15; %e A303810 1, 0, 0, 0, 0, 1, 2, 4, 22; %e A303810 1, 0, 0, 0, 0, 1, 1, 2, 7, 30; %e A303810 1, 0, 0, 0, 0, 0, 1, 1, 3, 8, 42; %e A303810 1, 0, 0, 0, 0, 0, 1, 1, 2, 4, 12, 56; %e A303810 1, 0, 0, 0, 0, 0, 0, 1, 1, 2, 5, 14, 77; %e A303810 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 3, 6, 21, 101; %e A303810 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 2, 3, 9, 24, 135; %e A303810 ... %Y A303810 Leading diagonal gives A000041. %Y A303810 Second diagonal gives A002865. %Y A303810 Row sums give A000041, n >= 1. %Y A303810 Columns 1-4: A000012, A000007, A033322, A278105. %Y A303810 Cf. A026794. %K A303810 nonn,tabl %O A303810 1,6 %A A303810 _Omar E. Pol_, May 05 2018