A140583 Triangle read by rows, A140581 * A000012.

1, 2, 1, 3, 1, 1, 2, 2, 1, 1, 5, 1, 1, 1, 1, 1, 4, 2, 1, 1, 1, 7, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 1, 1, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 6, 2, 2, 2, 1, 1, 1, 1, 1, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1

Offset

1,2

Comments

Left column = A014963: (1, 2, 3, 2, 5, 1, 7, 2, 3, 1, 11, ...).

Row sums = A140584: (1, 3, 5, 6, 9, 10, 13, ...).

Links

Table of n, a(n) for n=1..78.

Formula

Triangle read by rows, A140581 * A000012; where A000012 = the infinite lower triangular matrix with all 1's and the rest zeros: [1; 1,1; 1,1,1; ...].

Example

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

Crossrefs

Cf. A014963, A140584, A140581.

Sequence in context: A351094 A351092 A138618 * A237266 A123507 A188804

Adjacent sequences: A140580 A140581 A140582 * A140584 A140585 A140586

Keyword

nonn,tabl

Author

Gary W. Adamson and Mats Granvik, May 17 2008

Status

approved