A133113 - OEIS

A133113

A128174 * A007318 * A133080.

1, 2, 1, 4, 2, 1, 6, 4, 4, 1, 9, 6, 11, 4, 1, 12, 9, 24, 11, 6, 1, 16, 12, 46, 24, 22, 6, 1, 20, 16, 80, 46, 62, 22, 8, 1, 25, 20, 130, 80, 148, 62, 37, 8, 1, 30, 25, 200, 130, 314, 148, 128, 37, 10, 1

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OFFSET

1,2

COMMENTS

Row sums = 2^n - 1, A000225: (1, 3, 7, 15, 31, ...).

LINKS

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

FORMULA

A128174 * A007318 * A133080 as infinite lower triangular matrices.

EXAMPLE

First few rows of the triangle:

2, 1;

4, 2, 1;

6, 4, 4, 1;

9, 6, 11, 4, 1;

12, 9, 24, 11, 6, 1;

16, 12, 46, 24, 22, 6, 1;

20, 16, 80, 46, 62, 22, 8, 1;

...

CROSSREFS

Cf. A133080, A007318, A128174, A000225.

Sequence in context: A211956 A128177 A087738 * A124840 A145118 A124927

Adjacent sequences: A133110 A133111 A133112 * A133114 A133115 A133116

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Sep 14 2007

STATUS

approved