A132303 - cp's OEIS frontend

A132303 Sum of cubes of trinomial coefficients: a(n) = Sum_{k=0..2n} trinomial(n,k)^3 where trinomial(n,k) = [x^k] (1 + x + x^2)^n.

n	a(n)
0	1
1	3
2	45
3	831
4	17181
5	375903
6	8530929
7	198643455
8	4714491357
9	113550338127
10	2767105469745
11	68077260387315
12	1688160321677025
13	42142679453321307
14	1058050429855640217
15	26695057057648257231
16	676431705046728704733
17	17205315843416998571415
18	439098128408223839364561
19	11239967518370464873317291

[1, 3, 45, 831, 17181, 375903, 8530929, 198643455, 4714491357, 113550338127, 2767105469745, 68077260387315, 1688160321677025, 42142679453321307, 1058050429855640217, 26695057057648257231, 676431705046728704733, 17205315843416998571415, 439098128408223839364561, 11239967518370464873317291]

cp's OEIS Frontend

A132303 Sum of cubes of trinomial coefficients: a(n) = Sum_{k=0..2n} trinomial(n,k)^3 where trinomial(n,k) = [x^k] (1 + x + x^2)^n.

Table of values

List of values