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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.

A338032 Addition table of A337656, read by antidiagonals.

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%I A338032 #12 Oct 09 2020 03:35:57
%S A338032 0,1,1,3,2,3,7,4,4,7,12,8,6,8,12,20,13,10,10,13,20,30,21,15,14,15,21,
%T A338032 30,44,31,23,19,19,23,31,44,65,45,33,27,24,27,33,45,65,91,66,47,37,32,
%U A338032 32,37,47,66,91,107,92,68,51,42,40,42,51,68,92,107
%N A338032 Addition table of A337656, read by antidiagonals.
%H A338032 Peter Kagey, <a href="/A338032/b338032.txt">Table of n, a(n) for n = 1..10011</a> (first 141 antidiagonals, flattened)
%e A338032 Addition table begins:
%e A338032    + |  0  1  3  7 12 20 30  44  65
%e A338032 -----+-----------------------------
%e A338032    0 |  0  1  3  7 12 20 30  44  65
%e A338032    1 |  1  2  4  8 13 21 31  45  66
%e A338032    3 |  3  4  6 10 15 23 33  47  68
%e A338032    7 |  7  8 10 14 19 27 37  51  72
%e A338032   12 | 12 13 15 19 24 32 42  56  77
%e A338032   20 | 20 21 23 27 32 40 50  64  85
%e A338032   30 | 30 31 33 37 42 50 60  74  95
%e A338032   44 | 44 45 47 51 56 64 74  88 109
%e A338032   65 | 65 66 68 72 77 85 95 109 130
%Y A338032 Cf. A337656, A337657, A338031 (by rows), A338034 (multiplication table).
%Y A338032 Cf. A337660, A337973, A338015.
%K A338032 nonn,tabl
%O A338032 1,4
%A A338032 _Peter Kagey_, Oct 07 2020