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A338031 Triangular array read by rows: T(n,k) = A337656(n) + A337656(k) for 1 <= k <= n.

%I A338031 #12 Oct 09 2020 03:35:53
%S A338031 0,1,2,3,4,6,7,8,10,14,12,13,15,19,24,20,21,23,27,32,40,30,31,33,37,
%T A338031 42,50,60,44,45,47,51,56,64,74,88,65,66,68,72,77,85,95,109,130,91,92,
%U A338031 94,98,103,111,121,135,156,182,107,108,110,114,119,127,137,151,172,198,214
%N A338031 Triangular array read by rows: T(n,k) = A337656(n) + A337656(k) for 1 <= k <= n.
%H A338031 Peter Kagey, <a href="/A338031/b338031.txt">Table of n, a(n) for n = 1..10011</a> (first 141 rows, flattened)
%e A338031 Addition table begins:
%e A338031    + |  0  1  3  7 12 20 30  44  65
%e A338031 -----+-----------------------------
%e A338031    0 |  0
%e A338031    1 |  1  2
%e A338031    3 |  3  4  6
%e A338031    7 |  7  8 10 14
%e A338031   12 | 12 13 15 19 24
%e A338031   20 | 20 21 23 27 32 40
%e A338031   30 | 30 31 33 37 42 50 60
%e A338031   44 | 44 45 47 51 56 64 74  88
%e A338031   65 | 65 66 68 72 77 85 95 109 130
%Y A338031 Cf. A337656, A337657, A338032 (by antidiagonals), A338033 (multiplication).
%Y A338031 Cf. A337659, A337972, A338014.
%K A338031 nonn,tabl
%O A338031 1,3
%A A338031 _Peter Kagey_, Oct 07 2020