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 A349203 #12 Jan 15 2025 06:49:09 %S A349203 1,1,1,2,1,2,3,1,1,3,12,3,2,3,12,10,2,1,1,2,10,60,10,4,3,4,10,60,105, %T A349203 15,5,3,3,5,15,105,280,35,10,5,4,5,10,35,280,252,28,7,3,2,2,3,7,28, %U A349203 252,2520,252,56,21,12,10,12,21,56,252,2520 %N A349203 Triangle read by rows, T(n, k) = (lcm_{k=0..n} binomial(n, k)) / binomial(n, k). %e A349203 Triangle starts: %e A349203 [0] 1; %e A349203 [1] 1, 1; %e A349203 [2] 2, 1, 2; %e A349203 [3] 3, 1, 1, 3; %e A349203 [4] 12, 3, 2, 3, 12; %e A349203 [5] 10, 2, 1, 1, 2, 10; %e A349203 [6] 60, 10, 4, 3, 4, 10, 60; %e A349203 [7] 105, 15, 5, 3, 3, 5, 15, 105; %e A349203 [8] 280, 35, 10, 5, 4, 5, 10, 35, 280; %e A349203 [9] 252, 28, 7, 3, 2, 2, 3, 7, 28, 252; %p A349203 b := n -> ilcm(seq(binomial(n, k), k=0..n)): %p A349203 A349203 := (n, k) -> b(n)/binomial(n, k): %p A349203 seq(seq(A349203(n, k), k = 0..n), n = 0..11); %Y A349203 Cf. A007318, A347563, A025533 (row sums), A002944 (column 0 and main diagonal). %K A349203 nonn,tabl %O A349203 0,4 %A A349203 _Peter Luschny_, Nov 13 2021