login
A171999
Triangle of trinomial coefficients.
0
1, 1, 2, 1, 3, 6, 1, 4, 6, 12, 1, 5, 10, 20, 30, 1, 6, 15, 20, 30, 60, 90, 1, 7, 21, 35, 42, 105, 140, 210, 1, 8, 28, 56, 70, 168, 280, 420, 560, 1, 9, 36, 72, 84, 126, 252, 504, 630, 756, 1260, 1680, 1, 10, 45, 90, 120, 210, 252, 360, 840, 1260, 2520, 3150, 4200, 1, 11, 55
OFFSET
1,3
COMMENTS
Number of numbers in row n is given by A086753.
Row sums: A092255.
See A046816, Pascal's pyramid of trinomial coefficients.
EXAMPLE
First six rows:
1
1...2
1...3...6
1...4...6....12
1...5...10...20...30
1...6...15...20...30...60...90
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Clark Kimberling, Jan 21 2010
STATUS
approved