



1, 2, 1, 3, 2, 1, 4, 4, 2, 1, 5, 6, 4, 2, 1, 6, 9, 7, 4, 2, 1, 7, 12, 11, 7, 4, 2, 1, 8, 16, 16, 12, 7, 4, 2, 1, 9, 10, 23, 18, 12, 7, 4, 2, 1, 10, 25, 31, 27, 19, 12, 7, 4, 2, 1, 11, 30, 41, 38, 29, 19, 12, 7, 4, 2, 1, 12, 36, 53, 53, 42, 30, 19, 12, 7, 4, 2, 1
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OFFSET

1,2


COMMENTS

Row sums = A026905: (1, 3, 6, 11, 18, 29,...). Rows tend to A000070 starting from the right: (1, 2, 4, 7, 12, 19, 30,...).


LINKS

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


FORMULA

A000012 * A008284 as infinite lower triangular matrices.


EXAMPLE

First few rows of the triangle are:
1;
2, 1;
3, 2, 1;
4, 4, 2, 1;
5, 6, 4, 2, 1;
6, 9, 7, 4, 2, 1;
7, 12, 11, 7, 4, 2, 1;
8, 16, 16, 12, 7, 4, 2, 1;
...


CROSSREFS

Cf. A008284, A026905, A000070.
Sequence in context: A064881 A131967 A300670 * A152072 A105438 A062001
Adjacent sequences: A137676 A137677 A137678 * A137680 A137681 A137682


KEYWORD

nonn,tabl


AUTHOR

Gary W. Adamson, Feb 05 2008


STATUS

approved



