A139801 A139687(n) (1, 1, 1, 2, 2, 1) differences by rows, 0's deleted (*).Triangle on line.

1, 2, 2, 2, 3, 3, 3, 6, 9, 9, 3, 6, 10, 14, 14, 4, 10, 20, 34, 48, 48, 4, 10, 20, 35, 55, 75, 75, 5, 15, 35, 70, 125, 200, 275, 275, 5, 15, 35, 70, 126, 209, 319, 429, 429, 6, 21, 56, 126, 252, 461, 780, 1209, 1638, 1638

Offset

0,2

Comments

(*) Full Triangle:

0;

1, 0;

2, 2, 0;

2, 3, 3, 0;

3, 6, 9, 9, 0;

3, 6, 10, 14, 14, 0;

Links

Table of n, a(n) for n=0..54.

Formula

Even rows (with a leading 1) are in A139687.Must be separated from odd rows.

Crossrefs

Sequence in context: A161555 A029058 A046026 * A132328 A064822 A238337

Adjacent sequences: A139798 A139799 A139800 * A139802 A139803 A139804

Keyword

nonn,tabl,uned

Author

Paul Curtz, Jun 14 2008

Status

approved