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A135227 A000012 * A135225. 1
1, 2, 1, 3, 2, 1, 4, 3, 3, 1, 5, 4, 6, 4, 1, 6, 5, 10, 10, 5, 1, 7, 6, 15, 20, 15, 6, 1, 8, 7, 21, 35, 35, 21, 7, 1, 9, 8, 28, 56, 70, 56, 28, 8, 1, 10, 9, 36, 84, 126, 126, 84, 36, 9, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Row sums = A006127: (1, 3, 6, 11, 20, 37,...).

LINKS

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

FORMULA

A000012 * A135225 as infinite lower triangular matrices. Left border of 1's in Pascal's Triangle (A007318) is replaced with a column of (1,2,3,...).

EXAMPLE

First few rows of the triangle are:

1;

1, 2;

3, 2, 1;

4, 3, 3, 1;

5, 4, 6, 4, 1;

6, 5, 10, 10, 5, 1;

7, 6, 15, 20, 15, 6, 1;

...

CROSSREFS

Cf. A007318, A006127, A135225.

Sequence in context: A255238 A212536 A188277 * A104325 A204925 A133084

Adjacent sequences:  A135224 A135225 A135226 * A135228 A135229 A135230

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Nov 23 2007

STATUS

approved

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Last modified February 20 08:27 EST 2018. Contains 299377 sequences. (Running on oeis4.)