login
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
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;
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
KEYWORD
nonn,tabl,uned
AUTHOR
Paul Curtz, Jun 14 2008
STATUS
approved