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A193635
Triangle: T(n,k)=C(3n-k,k), 0<=k<=n.
2
1, 1, 2, 1, 5, 6, 1, 8, 21, 20, 1, 11, 45, 84, 70, 1, 14, 78, 220, 330, 252, 1, 17, 120, 455, 1001, 1287, 924, 1, 20, 171, 816, 2380, 4368, 5005, 3432, 1, 23, 231, 1330, 4845, 11628, 18564, 19448, 12870, 1, 26, 300, 2024, 8855, 26334, 54264, 77520, 75582
OFFSET
0,3
FORMULA
T(n,k)=C(3n-k,k), 0<=k<=n.
EXAMPLE
First 5 rows of A193635:
1
1...2
1...7....10
1...15...66....82
1...26...231...811...930
MATHEMATICA
p[n_, k_] := Binomial[3 n - k, k];
Table[p[n, k], {n, 0, 9}, {k, 0, n}] (* A193635 *)
Flatten[%]
CROSSREFS
Cf. A193636.
Sequence in context: A193816 A335136 A193722 * A241168 A145324 A260613
KEYWORD
nonn,tabl
AUTHOR
Clark Kimberling, Aug 01 2011
STATUS
approved