



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
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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



