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 A337973 #16 Oct 09 2020 17:19:46 %S A337973 2,4,4,8,6,8,13,10,10,13,23,15,14,15,23,31,25,19,19,25,31,48,33,29,24, %T A337973 29,33,48,62,50,37,34,34,37,50,62,86,64,54,42,44,42,54,64,86,114,88, %U A337973 68,59,52,52,59,68,88,114,127,116,92,73,69,60,69,73,92,116,127 %N A337973 Addition table from A337946, read by antidiagonals. %H A337973 Peter Kagey, <a href="/A337973/b337973.txt">Table of n, a(n) for n = 1..10011</a> (first 141 antidiagonals, flattened) %e A337973 Addition table for A337946 begins: %e A337973 + | 1 3 7 12 22 30 47 61 85 %e A337973 -----+-------------------------------- %e A337973 1 | 2 4 8 13 23 31 48 62 86 %e A337973 3 | 4 6 10 15 25 33 50 64 88 %e A337973 7 | 8 10 14 19 29 37 54 68 92 %e A337973 12 | 13 15 19 24 34 42 59 73 97 %e A337973 22 | 23 25 29 34 44 52 69 83 107 %e A337973 30 | 31 33 37 42 52 60 77 91 115 %e A337973 47 | 48 50 54 59 69 77 94 108 132 %e A337973 61 | 62 64 68 73 83 91 108 122 146 %e A337973 85 | 86 88 92 97 107 115 132 146 170 %Y A337973 Cf. A337660, A337946, A338015, A338032. %Y A337973 Cf. A337972 (by rows), A337975 (multiplication). %K A337973 nonn,tabl %O A337973 1,1 %A A337973 _Peter Kagey_, Oct 05 2020