A104715 Triangle T(n,k) = (2*k-1)*A000217(n-k+1) read by rows, 1<=k<=n.

1, 3, 3, 6, 9, 5, 10, 18, 15, 7, 15, 30, 30, 21, 9, 21, 45, 50, 42, 27, 11, 28, 63, 75, 70, 54, 33, 13, 36, 84, 105, 105, 90, 66, 39, 15, 45, 108, 140, 147, 135, 110, 78, 45, 17, 55, 135, 180, 196, 189, 165, 130, 90, 51, 19, 66, 165

Offset: 1

Author

Gary W. Adamson, Mar 20 2005

Keywords

• nonn
• tabl
• easy

Examples

			First few rows are:
1;
3, 3;
6, 9, 5;
10, 18, 15, 7;
15, 30, 30, 21, 9;
21, 45, 50, 42, 27, 11;
...
		

Crossrefs

Cf. A002415 (row sums), A104716.

Extensions

One term corrected by R. J. Mathar, Oct 29 2011