A089660 - cp's OEIS frontend

A089660 a(n) = S1(n,3), where S1(n, t) = Sum_{k=0..n} (k^t * Sum_{j=0..k} binomial(n,j)).

n	a(n)
0	0
1	2
2	35
3	276
4	1522
5	6820
6	26664
7	94640
8	312512
9	975744
10	2913280
11	8386048
12	23416320
13	63724544
14	169637888
15	443043840
16	1137934336
17	2879979520
18	7194083328
19	17761304576
20	43390730240
21	104997322752
22	251881062400
23	599482433536
24	1416470986752
25	3324615065600

[0, 2, 35, 276, 1522, 6820, 26664, 94640, 312512, 975744, 2913280, 8386048, 23416320, 63724544, 169637888, 443043840, 1137934336, 2879979520, 7194083328, 17761304576, 43390730240, 104997322752, 251881062400, 599482433536, 1416470986752, 3324615065600]

cp's OEIS Frontend

A089660 a(n) = S1(n,3), where S1(n, t) = Sum_{k=0..n} (k^t * Sum_{j=0..k} binomial(n,j)).

Table of values

List of values