A134199 A002260 + A134082 - I as infinite lower triangular matrices; I = Identity matrix.

1, 3, 2, 1, 6, 3, 1, 2, 9, 4, 1, 2, 3, 12, 5, 1, 2, 3, 4, 15, 6, 1, 2, 3, 4, 5, 18, 7, 1, 2, 3, 4, 5, 6, 21, 8, 1, 2, 3, 4, 5, 6, 7, 24, 9, 1, 2, 3, 4, 5, 6, 7, 8, 27, 10

Offset

0,2

Comments

Row sums = A052905: (1, 5, 10, 16, 23, 31, 40, ...).

Links

Table of n, a(n) for n=0..54.

Example

First few rows of the triangle:
  1;
  3,  2;
  1,  6,  3;
  1,  2,  9,  4;
  1,  2,  3, 12,  5;
  1,  2,  3,  4, 15,  6;
  1,  2,  3,  4,  5, 18,  7;
  ...

Crossrefs

Cf. A002260, A134082, A052905.

Sequence in context: A324644 A364256 A361470 * A323417 A102189 A031252

Adjacent sequences: A134196 A134197 A134198 * A134200 A134201 A134202

Keyword

nonn,tabl

Author

Gary W. Adamson, Oct 13 2007

Status

approved