A134543 A134542 * A000012.

1, 2, 1, 4, 3, 1, 6, 5, 3, 1, 10, 9, 6, 3, 1, 12, 11, 9, 6, 3, 1, 18, 17, 14, 10, 6, 3, 1, 22, 21, 18, 14, 10, 6, 3, 1, 28, 27, 24, 20, 15, 10, 6, 3, 1, 32, 31, 29, 25, 20, 15, 10, 6, 3, 1

Offset

1,2

Comments

Row sums = A015631: (1, 3, 8, 15, 29, 42, ...).

Left border = A002088: (1, 2, 4, 6, 10, 12, 18, 22, ...).

Conjecture: row terms starting from the right tend to the triangular series.

Links

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

Formula

A134542 * A000012 as infinite lower triangular matrices. Triangle read by rows, partial sums of A134542 terms starting from the right.

Example

First few rows of the triangle:
   1;
   2,  1;
   4,  3,  1;
   6,  5,  3,  1;
  10,  9,  6,  3,  1;
  12, 11,  9,  6,  3,  1;
  18, 17, 14, 10,  6,  3,  1;
  22, 21, 18, 14, 10,  6,  3,  1;
  28, 27, 24, 20, 15, 10,  6,  3,  1;
  ...

Crossrefs

Cf. A134542, A002088, A015631.

Sequence in context: A093682 A344767 A187883 * A305540 A197871 A093010

Adjacent sequences: A134540 A134541 A134542 * A134544 A134545 A134546

Keyword

nonn,tabl,more

Author

Gary W. Adamson, Oct 31 2007

Status

approved