A307663 - cp's OEIS frontend

A307663 a(n) = (n-1)!(Sum_{i=1..n} Sum_{j=1..i} binomial(i,j)i/j).

n	a(n)
1	1
2	6
3	41
4	329
5	3090
6	33654
7	420792
8	5981688
9	95782320
10	1712555280
11	33909364800
12	737868052800
13	17521164259200
14	451126883894400
15	12522623670144000
16	372847351488998400
17	11853064556660275200
18	400718191717647820800
19	14354714544806716416000
20	543129329390299739136000
21	21642934280974058207232000

[1, 6, 41, 329, 3090, 33654, 420792, 5981688, 95782320, 1712555280, 33909364800, 737868052800, 17521164259200, 451126883894400, 12522623670144000, 372847351488998400, 11853064556660275200, 400718191717647820800, 14354714544806716416000, 543129329390299739136000, 21642934280974058207232000]

cp's OEIS Frontend

A307663 a(n) = (n-1)!(Sum_{i=1..n} Sum_{j=1..i} binomial(i,j)i/j).

Table of values

List of values

cp's OEIS Frontend

A307663 a(n) = (n-1)!*(Sum_{i=1..n} Sum_{j=1..i} binomial(i,j)*i/j).

Table of values

List of values

A307663 a(n) = (n-1)!(Sum_{i=1..n} Sum_{j=1..i} binomial(i,j)i/j).