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A132119 A002260 + A000027 - A000012 as infinite lower triangular matrices. 1
1, 3, 3, 6, 5, 6, 10, 8, 9, 10, 15, 12, 13, 14, 15, 21, 17, 18, 19, 20, 21, 28, 23, 24, 25, 26, 27, 28, 36, 30, 31, 32, 33, 34, 35, 36, 45, 38, 39, 40, 41, 42, 43, 44, 45, 55, 47, 48, 49, 50, 51, 52, 53, 54, 55 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row sums = A132127: (1, 6, 17, 37, 69, 116,...).

LINKS

Table of n, a(n) for n=1..55.

EXAMPLE

First few rows of the triangle are:

1;

3, 3;

6, 5, 6;

10, 8, 9, 10;

15, 12, 13, 14, 15;

21, 17, 18, 19, 20, 21;

...

CROSSREFS

Cf. A002260, A000027, A000012, A132127.

Sequence in context: A050346 A319619 A142149 * A180681 A286102 A023822

Adjacent sequences:  A132116 A132117 A132118 * A132120 A132121 A132122

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Aug 10 2007

STATUS

approved

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Last modified May 25 19:11 EDT 2019. Contains 323576 sequences. (Running on oeis4.)