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A127735 A127701 * A002260. 3
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 (list; table; graph; refs; listen; history; text; internal format)
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

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

STATUS

approved

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Last modified May 20 05:35 EDT 2019. Contains 323418 sequences. (Running on oeis4.)