A144515 Triangle read by rows: A051731 * A103451.

1, 2, 1, 2, 0, 1, 3, 1, 0, 1, 2, 0, 0, 0, 1, 4, 1, 1, 0, 0, 1, 2, 0, 0, 0, 0, 0, 1, 4, 1, 0, 1, 0, 0, 0, 1, 3, 0, 1, 0, 0, 0, 0, 0, 1, 4, 1, 0, 0, 1, 0, 0, 0, 0, 1

Offset

0,2

Comments

Row sums = A114003: (1, 3, 3, 5, 3, 7, 3, 7, 5, 7,...).

Left border = d(n), A000005: (1, 2, 2, 3, 2, 4, 2, 4,...).

Links

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

Formula

A051731 * A103451 as infinite lower triangular matrices. Left border of A051731 (all 1's) is replaced with A000005: (1, 2, 2, 3, 2, 4,...).

Example

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

Crossrefs

Cf. A114003, A000005, A103451.

Sequence in context: A370852 A063574 A372095 * A178650 A028933 A190491

Adjacent sequences: A144512 A144513 A144514 * A144516 A144517 A144518

Keyword

nonn,tabl

Author

Gary W. Adamson, Nov 21 2007

Status

approved