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

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:
   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;
  ...

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