A133545 (A000012 * A007318 - A007318 * A000012) - A000012.

1, 3, 1, 6, 5, 1, 11, 12, 7, 1, 20, 24, 20, 9, 1, 37, 45, 45, 30, 11, 1, 70, 83, 91, 76, 42, 13, 1, 135, 154, 175, 168, 119, 56, 15, 1, 264, 290, 330, 344, 288, 176, 72, 17, 1, 521, 555, 621, 675, 633, 465, 249, 90, 19, 1

Offset

1,2

Comments

Row sums = A133546: (1, 4, 12, 31, 74, 169, ...).

Left border = A006127: (1, 3, 6, 11, 20, ...).

Links

Table of n, a(n) for n=1..55.

Formula

(A000012 * A007318 - A007318 * A000012) - A000012 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
   3,  1;
   6,  5,  1;
  11, 12,  7,  1;
  20, 24, 20,  9,  1;
  37, 45, 45, 30, 11,  1;
  70, 83, 91, 76, 42, 13,  1;
  ...

Crossrefs

Cf. A000012, A007318, A133546, A006127.

Sequence in context: A109954 A355010 A153641 * A210214 A322427 A209149

Adjacent sequences: A133542 A133543 A133544 * A133546 A133547 A133548

Keyword

nonn,tabl

Author

Gary W. Adamson, Sep 15 2007

Status

approved