A089668 - cp's OEIS frontend

A089668 a(n) = S2(n,5), 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	521
3	17136
4	320716
5	4356560
6	48024786
7	456843520
8	3893995184
9	30487086144
10	223052123830
11	1544098243424
12	10208488021176
13	64917814932256
14	399310478637476
15	2386386863086080
16	13906802738650816
17	79261768839946496
18	442921922267640894

[0, 4, 521, 17136, 320716, 4356560, 48024786, 456843520, 3893995184, 30487086144, 223052123830, 1544098243424, 10208488021176, 64917814932256, 399310478637476, 2386386863086080, 13906802738650816, 79261768839946496, 442921922267640894]

cp's OEIS Frontend

A089668 a(n) = S2(n,5), where S2(n, t) = Sum_{k=0..n} k^t *(Sum_{j=0..k} binomial(n,j))^2.

Table of values

List of values