A110377 - OEIS

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A110377 as a simple table

n	a(n)
1	1
2	2
3	9
4	28
5	205
6	726
7	8659
8	47384
9	562545
10	4234330
11	68588311
12	483088332
13	10699776685
14	102434734598
15	2016289908585
16	24588487650736
17	611171244308689
18	6456997293606738
19	209020565553571999
20	2838875160624256460

[1,2,9,28,205,726,8659,47384,562545,4234330, 68588311,483088332,10699776685,102434734598, 2016289908585,24588487650736,611171244308689, 6456997293606738,209020565553571999, 2838875160624256460]