

A127735


Triangle read by rows: A127701 * A002260 as infinite lower triangular matrices.


2



1, 3, 4, 4, 8, 9, 5, 10, 15, 16, 6, 12, 18, 24, 25, 7, 14, 21, 28, 35, 36, 8, 16, 24, 32, 40, 48, 49, 9, 18, 27, 36, 45, 54, 63, 64, 10, 20, 30, 40, 50, 60, 70, 80, 81, 11, 22, 33, 44, 55, 66, 77, 88, 99, 100, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 121, 13, 26, 39, 52, 65, 78, 91, 104, 117, 130, 143, 144
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OFFSET

1,2


LINKS



FORMULA

Row sums = A127736: (1, 7, 21, 46, 85, 141, ...).
T(n,n) = n^2. T(n,k) = k*(n+1), 1<=k<n.  R. J. Mathar, Jul 21 2009


EXAMPLE

First few rows of the triangle are:
1;
3, 4;
4, 8, 9;
5, 10, 15, 16;
6, 12, 18, 24, 25;
...


CROSSREFS



KEYWORD



AUTHOR



EXTENSIONS

Anumber of left factor in the definition corrected by R. J. Mathar, Jul 21 2009


STATUS

approved



