A140582 Triangle read by rows, A000012 * A140581.

1, 2, 1, 4, 1, 1, 4, 2, 1, 1, 8, 2, 1, 1, 1, 5, 4, 2, 1, 1, 1, 11, 4, 2, 1, 1, 1, 1, 11, 4, 2, 2, 1, 1, 1, 1, 11, 4, 4, 2, 1, 1, 1, 1, 1, 6, 8, 4, 2, 2, 1, 1, 1, 1, 1, 16, 8, 4, 2, 1, 1, 1, 1, 1, 1, 16, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 28, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1

Offset

0,2

Comments

Row sums = A072107: (1, 3, 6, 8, 13, 14,...).

Links

Table of n, a(n) for n=0..89.

Formula

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

Example

First few rows of the triangle are:
1;
2, 1;
4, 1, 1;
4, 2, 1, 1;
8, 2, 1, 1, 1;
5, 4, 2, 1, 1, 1;
11, 4, 2, 1, 1, 1, 1;
11, 4, 2, 2, 1, 1, 1, 1;
11, 4, 4, 2, 1, 1, 1, 1, 1;
6, 8, 4, 2, 2, 1, 1, 1, 1, 1;
...

Crossrefs

Cf. A140581, A072107.

Sequence in context: A072918 A255878 A162944 * A062866 A131035 A339833

Adjacent sequences: A140579 A140580 A140581 * A140583 A140584 A140585

Keyword

nonn,tabl

Author

Gary W. Adamson and Mats Granvik, May 17 2008

Status

approved