A274294 - cp's OEIS frontend

A274294 a(n) = 1+(n+1)^2+n!+Sum_{k=1..n-1} binomial(n,k)*n!/(n-k)!.

n	a(n)
0	3
1	6
2	16
3	50
4	234
5	1582
6	13376
7	130986
8	1441810
9	17572214
10	234662352
11	3405357826
12	53334454586
13	896324308830
14	16083557845504
15	306827170866362
16	6199668952527906
17	132240988644216166
18	2968971263911289360
19	69974827707903049554
20	1727194482044146637962

[3, 6, 16, 50, 234, 1582, 13376, 130986, 1441810, 17572214, 234662352, 3405357826, 53334454586, 896324308830, 16083557845504, 306827170866362, 6199668952527906, 132240988644216166, 2968971263911289360, 69974827707903049554, 1727194482044146637962]

cp's OEIS Frontend

A274294 a(n) = 1+(n+1)^2+n!+Sum_{k=1..n-1} binomial(n,k)*n!/(n-k)!.

Table of values

List of values