A131231 - OEIS

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

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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

FORMULA

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

EXAMPLE

First few rows of the triangle:

6, 1;

7, 3, 1;

12, 1, 3, 1;

13, 3, 1, 3, 1;

...

CROSSREFS

KEYWORD

nonn,tabl

AUTHOR

STATUS

approved