A140703 A000012 * A051731^3.

1, 4, 1, 7, 1, 1, 13, 4, 1, 1, 16, 4, 1, 1, 1, 25, 7, 4, 1, 1, 1, 28, 7, 4, 1, 1, 1, 1, 38, 13, 4, 4, 1, 1, 1, 1, 44, 13, 7, 4, 1, 1, 1, 1, 1, 53, 16, 7, 4, 4, 1, 1, 1, 1, 1, 56, 16, 7, 4, 4, 1, 1, 1, 1, 1, 1

Offset

1,2

Comments

Row sums = A061202: (1, 5, 9, 19, 23, 39,...).

Leftmost column = A061201: (1, 4, 7, 13, 16, 25, 28,...).

Links

Table of n, a(n) for n=1..66.

Formula

A000012 * A051731^3 as infinite lower triangular matrices, where A000012 = [1; 1,1; 1,1,1;...] and A051731 = the inverse Mobius transform.

Example

First few rows of the triangle are:
1;
4, 1;
7, 1, 1;
13, 4, 1, 1;
16, 4, 1, 1, 1;
25, 7, 4, 1, 1, 1;
28, 7, 4, 1, 1, 1, 1;
38, 13, 4, 4, 1, 1, 1, 1;
...

Crossrefs

Cf. A051731, A061202, A061201.

Sequence in context: A248831 A227729 A096966 * A346533 A157259 A046551

Adjacent sequences: A140700 A140701 A140702 * A140704 A140705 A140706

Keyword

nonn,tabl

Author

Gary W. Adamson, May 24 2008

Status

approved