A338031 - OEIS

%I #12 Oct 09 2020 03:35:53

%S 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 42,50,60,44,45,47,51,56,64,74,88,65,66,68,72,77,85,95,109,130,91,92,

%U 94,98,103,111,121,135,156,182,107,108,110,114,119,127,137,151,172,198,214

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

%H Peter Kagey, <a href="/A338031/b338031.txt">Table of n, a(n) for n = 1..10011</a> (first 141 rows, flattened)

%e Addition table begins:

%e    + |  0  1  3  7 12 20 30  44  65

%e -----+-----------------------------

%e    0 |  0

%e    1 |  1  2

%e    3 |  3  4  6

%e    7 |  7  8 10 14

%e   12 | 12 13 15 19 24

%e   20 | 20 21 23 27 32 40

%e   30 | 30 31 33 37 42 50 60

%e   44 | 44 45 47 51 56 64 74  88

%e   65 | 65 66 68 72 77 85 95 109 130

%Y Cf. A337656, A337657, A338032 (by antidiagonals), A338033 (multiplication).

%Y Cf. A337659, A337972, A338014.

%K nonn,tabl

%O 1,3

%A _Peter Kagey_, Oct 07 2020