A366203 - cp's OEIS frontend

A366203 a(n) = (1/n) * Sum_{k=0..n-1} binomial(n+k-1,k) * binomial(3n,n-k-1) (n-3)^k.

n	a(n)
1	1
2	2
3	12
4	156
5	3507
6	115692
7	5066364
8	276943568
9	18152243967
10	1387267590540
11	121106707350928
12	11889022355301672
13	1296359140925188212
14	155440199716271334648
15	20327081449263918542412
16	2879054747404226046119448
17	439060192463001381367975215
18	71727764882350305085962745740

[1, 2, 12, 156, 3507, 115692, 5066364, 276943568, 18152243967, 1387267590540, 121106707350928, 11889022355301672, 1296359140925188212, 155440199716271334648, 20327081449263918542412, 2879054747404226046119448, 439060192463001381367975215, 71727764882350305085962745740]

cp's OEIS Frontend

A366203 a(n) = (1/n) * Sum_{k=0..n-1} binomial(n+k-1,k) * binomial(3n,n-k-1) (n-3)^k.

Table of values

List of values

cp's OEIS Frontend

A366203 a(n) = (1/n) * Sum_{k=0..n-1} binomial(n+k-1,k) * binomial(3*n,n-k-1) * (n-3)^k.

Table of values

List of values

A366203 a(n) = (1/n) * Sum_{k=0..n-1} binomial(n+k-1,k) * binomial(3n,n-k-1) (n-3)^k.