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A139801 A139687(n) (1, 1, 1, 2, 2, 1) differences by rows, 0's deleted (*).Triangle on line. 1
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 (list; table; graph; refs; listen; history; text; internal format)
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

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Last modified September 22 12:59 EDT 2019. Contains 327307 sequences. (Running on oeis4.)