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 A334548 #10 May 08 2020 15:15:37 %S A334548 1,1,1,1,2,1,1,2,5,1,1,2,8,14,1,1,2,8,45,43,1,1,2,8,64,315,142,1,1,2, %T A334548 8,64,809,2634,499,1,1,2,8,64,1024,13846,25518,1850,1,1,2,8,64,1024, %U A334548 28217,301262,280257,7193,1,1,2,8,64,1024,32768,1146419,8035168,3434595,29186,1 %N A334548 Array read by antidiagonals: T(n,k) is the number of n X n symmetric binary matrices with no row sum greater than k. %F A334548 T(n,k) = 2^(n*(n+1)/2) = A006125(n+1) for k >= n. %e A334548 Array begins: %e A334548 ============================================================= %e A334548 n\k | 0 1 2 3 4 5 6 %e A334548 ----|------------------------------------------------------- %e A334548 0 | 1 1 1 1 1 1 1 ... %e A334548 1 | 1 2 2 2 2 2 2 ... %e A334548 2 | 1 5 8 8 8 8 8 ... %e A334548 3 | 1 14 45 64 64 64 64 ... %e A334548 4 | 1 43 315 809 1024 1024 1024 ... %e A334548 5 | 1 142 2634 13846 28217 32768 32768 ... %e A334548 6 | 1 499 25518 301262 1146419 1914733 2097152 ... %e A334548 7 | 1 1850 280257 8035168 62951431 178499118 254409765 ... %e A334548 ... %Y A334548 Column k=0..9 are A000012, A005425, A139678, A139679, A139680, A139681, A139682, A139683, A139684, A139685. %Y A334548 Cf. A006125, A135589, A333157. %K A334548 nonn,tabl %O A334548 0,5 %A A334548 _Andrew Howroyd_, May 08 2020