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 A337975 #14 Oct 09 2020 17:18:59 %S A337975 1,3,3,7,9,7,12,21,21,12,22,36,49,36,22,30,66,84,84,66,30,47,90,154, %T A337975 144,154,90,47,61,141,210,264,264,210,141,61,85,183,329,360,484,360, %U A337975 329,183,85,113,255,427,564,660,660,564,427,255,113,126,339,595,732,1034,900,1034,732,595,339,126 %N A337975 Multiplication table from A337946, read by antidiagonals. %H A337975 Peter Kagey, <a href="/A337975/b337975.txt">Table of n, a(n) for n = 1..10011</a> (first 141 antidiagonals, flattened) %e A337975 Multiplication table for A337946 begins: %e A337975 * | 1 3 7 12 22 30 47 61 85 %e A337975 -----+----------------------------------------- %e A337975 1 | 1 3 7 12 22 30 47 61 85 %e A337975 3 | 3 9 21 36 66 90 141 183 255 %e A337975 7 | 7 21 49 84 154 210 329 427 595 %e A337975 12 | 12 36 84 144 264 360 564 732 1020 %e A337975 22 | 22 66 154 264 484 660 1034 1342 1870 %e A337975 30 | 30 90 210 360 660 900 1410 1830 2550 %e A337975 47 | 47 141 329 564 1034 1410 2209 2867 3995 %e A337975 61 | 61 183 427 732 1342 1830 2867 3721 5185 %e A337975 85 | 85 255 595 1020 1870 2550 3995 5185 7225 %Y A337975 Cf. A337662, A337946, A338017, A338034. %Y A337975 Cf. A337973 (addition), A337974 (read by rows). %K A337975 nonn,tabl %O A337975 1,2 %A A337975 _Peter Kagey_, Oct 05 2020