A132819 A001263 * A127773.

1, 1, 3, 1, 9, 6, 1, 18, 36, 10, 1, 30, 120, 100, 15, 1, 45, 300, 500, 225, 21, 1, 63, 630, 1750, 1575, 441, 28, 1, 84, 1176, 4900, 7350, 4116, 784, 36, 1, 108, 2016, 11760, 26460, 24696, 9408, 1296, 45, 1, 135, 3240, 25200, 79380, 111132, 70560, 19440

Offset

1,3

Comments

Row sums = A132820: (1, 4, 16, 65, 266, ...).

Links

Table of n, a(n) for n=1..53.

Formula

A001263 * A127773 as infinite lower triangular matrices.

Example

First few rows of the triangle are:
  1;
  1,  3;
  1,  9,   6;
  1, 18,  36,  10;
  1, 30, 120, 100,  15;
  1, 45, 300, 500, 225, 21;
  ...

Crossrefs

Cf. A001263, A127773, A132820.

Sequence in context: A337680 A077895 A105539 * A264364 A330509 A105545

Adjacent sequences: A132816 A132817 A132818 * A132820 A132821 A132822

Keyword

nonn,tabl

Author

Gary W. Adamson, Sep 02 2007

Status

approved