A089666 - cp's OEIS frontend

A089666 a(n) = S2(n,3), where S2(n, t) = Sum_{k=0..n} k^t *(Sum_{j=0..k} binomial(n,j))^2.

n	a(n)
0	0
1	4
2	137
3	2136
4	23452
5	209840
6	1640346
7	11648224
8	76976048
9	481048128
10	2874897670
11	16564931504
12	92584313112
13	504313834336
14	2687067833492
15	14045889333120
16	72202366588096
17	365713117287680
18	1828223537042142
19	9032706189007888
20	44158716127799240
21	213826835772518304

[0, 4, 137, 2136, 23452, 209840, 1640346, 11648224, 76976048, 481048128, 2874897670, 16564931504, 92584313112, 504313834336, 2687067833492, 14045889333120, 72202366588096, 365713117287680, 1828223537042142, 9032706189007888, 44158716127799240, 213826835772518304]

cp's OEIS Frontend

A089666 a(n) = S2(n,3), where S2(n, t) = Sum_{k=0..n} k^t *(Sum_{j=0..k} binomial(n,j))^2.

Table of values

List of values