A338016 Triangular array read by rows: T(n,k) = A338012(n) * A338012(k) for 1 <= k <= n.

0, 0, 9, 0, 12, 16, 0, 30, 40, 100, 0, 54, 72, 180, 324, 0, 69, 92, 230, 414, 529, 0, 102, 136, 340, 612, 782, 1156, 0, 165, 220, 550, 990, 1265, 1870, 3025, 0, 201, 268, 670, 1206, 1541, 2278, 3685, 4489, 0, 279, 372, 930, 1674, 2139, 3162, 5115, 6231, 8649

Offset

1,3

Links

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

Example

Multiplication table begins:
   * | 0   3   4  10   18   23   34   55   67
-----+---------------------------------------
   0 | 0
   3 | 0   9
   4 | 0  12  16
  10 | 0  30  40 100
  18 | 0  54  72 180  324
  23 | 0  69  92 230  414  529
  34 | 0 102 136 340  612  782 1156
  55 | 0 165 220 550  990 1265 1870 3025
  67 | 0 201 268 670 1206 1541 2278 3685 4489

Crossrefs

Cf. A338012, A338014 (addition), A338017 (by antidiagonals).

Cf. A337661, A337974.

Sequence in context: A349825 A320379 A308102 * A062047 A117465 A136679

Adjacent sequences: A338013 A338014 A338015 * A338017 A338018 A338019

Keyword

nonn,tabl

Author

Peter Kagey, Oct 06 2020

Status

approved