A131231 3*A130296 - 2*A128174.

1, 6, 1, 7, 3, 1, 12, 1, 3, 1, 13, 3, 1, 3, 1, 18, 1, 3, 1, 3, 1, 19, 3, 1, 3, 1, 3, 1, 24, 1, 3, 1, 3, 1, 3, 1, 25, 3, 1, 3, 1, 3, 1, 3, 1

Offset

1,2

Comments

Left column = A047225, numbers congruent to {0,1} mod 6: (1, 6, 7, 12, 13, 18, 19, ...).

Row sums = A131229, numbers congruent to {1,7} mod 10: (1, 7, 11, 17, ...).

Links

Table of n, a(n) for n=1..45.

Formula

3*A130296 - 2*A128174 as infinite lower triangular matrices.

Example

First few rows of the triangle:
   1;
   6, 1;
   7, 3, 1;
  12, 1, 3, 1;
  13, 3, 1, 3, 1;
  ...

Crossrefs

Cf. A131229, A047225, A130296, A128174.

Sequence in context: A028323 A137235 A021166 * A200307 A260632 A330062

Adjacent sequences: A131228 A131229 A131230 * A131232 A131233 A131234

Keyword

nonn,tabl

Author

Gary W. Adamson, Jun 20 2007

Status

approved