A085389 - cp's OEIS frontend

A085389 a(1) = 1; for n >= 2, a(n) = (n*(n+1)^(n-1))/(n+1).

n	a(n)
1	1
2	2
3	12
4	100
5	1080
6	14406
7	229376
8	4251528
9	90000000
10	2143588810
11	56757583872
12	1654301902188
13	52644347205632
14	1816448730468750
15	67553994410557440
16	2694045224950414864
17	114692890480116793344
18	5191945444217181018258
19	249036800000000000000000
20	12617615847934310595791220

[1, 2, 12, 100, 1080, 14406, 229376, 4251528, 90000000, 2143588810, 56757583872, 1654301902188, 52644347205632, 1816448730468750, 67553994410557440, 2694045224950414864, 114692890480116793344, 5191945444217181018258, 249036800000000000000000, 12617615847934310595791220]

cp's OEIS Frontend

A085389 a(1) = 1; for n >= 2, a(n) = (n*(n+1)^(n-1))/(n+1).

Table of values

List of values