



1, 1, 3, 1, 6, 4, 1, 9, 12, 5, 1, 12, 24, 20, 7, 1, 15, 40, 50, 35, 8, 1, 18, 60, 100, 105, 48, 9, 1, 21, 84, 175, 245, 168, 63, 11, 1, 24, 112, 280, 490, 448, 252, 88, 12, 1, 27, 144, 420, 88, 1008, 756, 396, 108, 13
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OFFSET

1,3


COMMENTS

Row sums = A100335: (1, 4, 11, 27, 64, 149,...).


LINKS

Table of n, a(n) for n=1..55.


FORMULA

Binomial transform of A133109, as an infinite lower triangular matrix.


EXAMPLE

First few rows of the triangle are:
1;
1, 3;
1, 6, 4;
1, 9, 12, 5;
1, 12, 24, 20, 7;
1, 15, 40, 50, 35, 8;
1, 18, 60, 100, 105, 48, 9;
...


CROSSREFS

Cf. A133109, A100335.
Sequence in context: A070883 A120029 A201904 * A286158 A185915 A086270
Adjacent sequences: A133107 A133108 A133109 * A133111 A133112 A133113


KEYWORD

nonn,tabl


AUTHOR

Gary W. Adamson, Sep 12 2007


STATUS

approved



