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A131899 A002260 + A131821 - A000012. 1
1, 2, 3, 3, 2, 5, 4, 2, 3, 7, 5, 2, 3, 4, 9, 6, 2, 3, 4, 5, 11, 7, 2, 3, 4, 5, 6, 13, 8, 2, 3, 4, 5, 6, 7, 15, 9, 2, 3, 4, 5, 6, 7, 8, 17, 10, 2, 3, 4, 5, 6, 7, 8, 9, 19 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Row sums = A052905: (1, 5, 10, 16, 23,...)

LINKS

Table of n, a(n) for n=0..54.

FORMULA

A002260 + A131821 - A000012 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle are:

1;

2, 3;

3, 2, 5;

4, 2, 3, 7;

5, 2, 3, 4, 9;

6, 2, 3, 4, 5, 11;

7, 2, 3, 4, 5, 6, 13;

...

CROSSREFS

Cf. A002260, A131821, A052905.

Sequence in context: A326699 A138652 A323833 * A095174 A131307 A336168

Adjacent sequences:  A131896 A131897 A131898 * A131900 A131901 A131902

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jul 25 2007

STATUS

approved

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Last modified August 15 13:27 EDT 2020. Contains 336504 sequences. (Running on oeis4.)