A131256 A000012(signed) * A052509.

1, 0, 1, 1, 1, 1, 0, 2, 1, 1, 1, 2, 3, 1, 1, 0, 3, 4, 3, 1, 1, 1, 3, 7, 5, 3, 1, 1, 0, 4, 9, 10, 5, 3, 1, 11, 4, 13, 16, 11, 5, 3, 1, 1, 0, 5, 16, 26, 20, 11, 5, 3, 1, 1

Offset

0,8

Comments

Row sums = A052952: (1, 1, 3, 4, 8, 12, 21, 33, ...). A131257 = A052509 * A000012(signed).

Links

Table of n, a(n) for n=0..53.

Formula

A000012(signed) * A052509, where the signed version of A000012 = (1; -1,1; 1,-1,1; ...).

Example

First few rows of the triangle:
  1;
  0, 1;
  1, 1, 1;
  0, 2, 1, 1;
  1, 2, 3, 1, 1;
  0, 3, 4, 3, 1, 1;
  1, 3, 7, 5, 3, 1, 1;
  ...

Crossrefs

Cf. A052509, A000012, A131257.

Sequence in context: A284995 A243005 A058393 * A362414 A245562 A304495

Adjacent sequences: A131253 A131254 A131255 * A131257 A131258 A131259

Keyword

nonn,tabl

Author

Gary W. Adamson, Jun 23 2007

Status

approved