A338033 - OEIS

%I #13 Oct 09 2020 03:36:01

%S 0,0,1,0,3,9,0,7,21,49,0,12,36,84,144,0,20,60,140,240,400,0,30,90,210,

%T 360,600,900,0,44,132,308,528,880,1320,1936,0,65,195,455,780,1300,

%U 1950,2860,4225,0,91,273,637,1092,1820,2730,4004,5915,8281

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

%H Peter Kagey, <a href="/A338033/b338033.txt">Table of n, a(n) for n = 1..10011</a> (first 141 rows, flattened)

%e Multiplication table begins:

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

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

%e    0 | 0

%e    1 | 0  1

%e    3 | 0  3   9

%e    7 | 0  7  21  49

%e   12 | 0 12  36  84 144

%e   20 | 0 20  60 140 240  400

%e   30 | 0 30  90 210 360  600  900

%e   44 | 0 44 132 308 528  880 1320 1936

%e   65 | 0 65 195 455 780 1300 1950 2860 4225

%Y Cf. A337656, A337657, A338031 (addition), A338034 (by antidiagonals).

%Y Cf. A337661, A337974, A338016.

%K nonn,tabl

%O 1,5

%A _Peter Kagey_, Oct 07 2020