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 A272172 #41 Jan 24 2022 16:09:58 %S A272172 1,3,1,4,3,1,7,4,3,1,6,7,4,3,1,12,6,7,4,3,1,8,12,6,7,4,3,1,15,8,12,6, %T A272172 7,4,3,1,13,15,8,12,6,7,4,3,1,18,13,15,8,12,6,7,4,3,1,12,18,13,15,8, %U A272172 12,6,7,4,3,1,28,12,18,13,15,8,12,6,7,4,3,1,14,28,12,18,13,15,8,12,6,7,4,3,1,24,14,28 %N A272172 Triangle read by rows: T(n,k) in which row n lists the first n terms of A000203 in reverse order. %F A272172 a(n) = A000203(A004736(n)). %F A272172 T(n,k) = A000203(n-k+1). %e A272172 Triangle begins: %e A272172 1; %e A272172 3, 1; %e A272172 4, 3, 1; %e A272172 7, 4, 3, 1; %e A272172 6, 7, 4, 3, 1; %e A272172 12, 6, 7, 4, 3, 1; %e A272172 8, 12, 6, 7, 4, 3, 1; %e A272172 15, 8, 12, 6, 7, 4, 3, 1; %e A272172 13, 15, 8, 12, 6, 7, 4, 3, 1; %e A272172 18, 13, 15, 8, 12, 6, 7, 4, 3, 1; %e A272172 12, 18, 13, 15, 8, 12, 6, 7, 4, 3, 1; %e A272172 28, 12, 18, 13, 15, 8, 12, 6, 7, 4, 3, 1; %e A272172 ... %Y A272172 Mirror of A245093. %Y A272172 Column k gives A000203 starting in row k. %Y A272172 Row sums give A024916. %Y A272172 Cf. A004736, A104887, A272171. %K A272172 nonn,tabl %O A272172 1,2 %A A272172 _Omar E. Pol_, Apr 21 2016