



1, 1, 2, 0, 0, 3, 1, 2, 0, 4, 0, 0, 0, 0, 5, 0, 0, 3, 0, 0, 6, 0, 0, 0, 0, 0, 0, 7, 1, 2, 0, 4, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 5, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 0, 3, 0, 0, 6, 0, 0, 0, 0, 0, 12
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OFFSET

1,3


COMMENTS

row sums = A129527: (1, 3 3, 7, 5, 9, 7, 15,...)


LINKS

Table of n, a(n) for n=1..78.


FORMULA

Let A = the ruler function triangle A115361 as an infinite lower triangular matrix, and B = A127648 (a triangle with the natural numbers as the main diagonal and the rest zeros).
The triangle = A*B, as infinite lower triangular matrices.


EXAMPLE

First few rows of the triangle =
1
1, 2
0, 0, 3
1, 2, 0, 4
0, 0, 0, 0, 5
0, 0, 3, 0, 0, 6
0, 0, 0, 0, 0, 0, 7
1, 2, 0, 4, 0, 0, 0, 8
0, 0, 0, 0, 0, 0, 0, 0, 9
0, 0, 0, 0, 5, 0, 0, 0, 0, 10
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11
0, 0, 3, 0, 0, 6, 0, 0, 0, 0, 0, 12
...


CROSSREFS

Cf. A115361, A127648, A129527
Sequence in context: A082660 A134673 A131636 * A077888 A319668 A167634
Adjacent sequences: A188020 A188021 A188022 * A188024 A188025 A188026


KEYWORD

tabl,nonn


AUTHOR

Gary W. Adamson, Mar 19 2011


STATUS

approved



