A143540 Triangle read by rows, (A143538)^2; 1<=k<=n.

0, 0, 1, 0, 2, 1, 0, 2, 1, 0, 0, 3, 2, 0, 1, 0, 3, 2, 0, 1, 0, 0, 4, 3, 0, 2, 0, 1, 0, 4, 3, 0, 2, 0, 1, 0, 0, 4, 3, 0, 2, 0, 1, 0, 0, 0, 4, 3, 0, 2, 0, 1, 0, 0, 0, 0, 5, 4, 0, 3, 0, 2, 0, 0, 0, 1

Offset

1,5

Comments

Row sums = A079551: (0, 1, 3, 3, 6, 6, 10,...).

Links

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

Formula

Square of triangle A143538.

Example

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

Crossrefs

Cf. A143538, A079551.

Sequence in context: A286137 A320658 A284966 * A291336 A208664 A030200

Adjacent sequences: A143537 A143538 A143539 * A143541 A143542 A143543

Keyword

nonn,tabl

Author

Gary W. Adamson, Aug 23 2008

Status

approved