



1, 3, 4, 4, 8, 9, 5, 10, 15, 16, 6, 12, 18, 24, 25, 7, 14, 21, 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
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..44.


FORMULA

A127701 * A002260 as infinite lower triangular matrices.
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

Row sums = A127735: (1, 7, 21, 46, 85, 141, ...).
Sequence in context: A146944 A294113 A240875 * A075550 A292729 A137529
Adjacent sequences: A127732 A127733 A127734 * A127736 A127737 A127738


KEYWORD

nonn,tabl


AUTHOR

Gary W. Adamson, Jan 26 2007


EXTENSIONS

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


STATUS

approved



