A338033 Triangular array read by rows: T(n,k) = A337656(n) * A337656(k) for 1 <= k <= n.

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, 360, 600, 900, 0, 44, 132, 308, 528, 880, 1320, 1936, 0, 65, 195, 455, 780, 1300, 1950, 2860, 4225, 0, 91, 273, 637, 1092, 1820, 2730, 4004, 5915, 8281

Offset: 1

Author

Peter Kagey, Oct 07 2020

Keywords

• nonn
• tabl

Examples

			Multiplication table begins:
   * | 0  1   3   7  12   20   30   44   65
-----+-------------------------------------
   0 | 0
   1 | 0  1
   3 | 0  3   9
   7 | 0  7  21  49
  12 | 0 12  36  84 144
  20 | 0 20  60 140 240  400
  30 | 0 30  90 210 360  600  900
  44 | 0 44 132 308 528  880 1320 1936
  65 | 0 65 195 455 780 1300 1950 2860 4225
		

Links

• Peter Kagey, Table of n, a(n) for n = 1..10011 (first 141 rows, flattened)

Crossrefs

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

Cf. A337661, A337974, A338016.