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A132118 A000027 + A002260 - A000012. 1
1, 2, 4, 4, 6, 8, 7, 9, 11, 13, 11, 13, 15, 17, 19, 26, 28, 20, 22, 24, 26, 22, 24, 26, 28, 30, 32, 34, 29, 31, 33, 35, 37, 39, 41, 43, 37, 39, 41, 43, 45, 47, 49, 51, 53, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row sums = A002411: (1, 6, 18, 40, 75, 126,...).

LINKS

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

FORMULA

A000027 + A002260 - A000012 as infinite lower triangular matrices; where A000027 = [1; 2,3; 4,5,6;...]; A002260 = [1; 1,2; 1,2,3;...]; and A000012 = [1; 1,1; 1,1,1;...].

EXAMPLE

First few rows of the triangle are:

1;

2, 4;

4, 6, 8;

7, 9, 11, 13;

11, 13, 15, 17, 19;

16, 18, 20, 22, 24, 26;

22, 24, 26, 28, 30, 32, 34;

29, 31, 33, 35, 37, 39 41, 43;

...

CROSSREFS

Cf. A002260, A000027, A000012, A002411.

Sequence in context: A288574 A135692 A089003 * A221952 A007843 A239826

Adjacent sequences:  A132115 A132116 A132117 * A132119 A132120 A132121

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Aug 10 2007

STATUS

approved

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Last modified May 23 11:20 EDT 2019. Contains 323514 sequences. (Running on oeis4.)