A080146 - OEIS

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A080146 as a simple table

n	a(n)
1	1
2	2
3	9
4	52
5	738
6	2829
7	53643
8	162438
9	4023888
10	166236537
11	921787428
12	48034254669
13	935251837851
14	2558696229078
15	68055676507664
16	2655011771373417
17	210067141980993186
18	831463105466530077
19	42882922858578320598

[1,2,9,52,738,2829,53643,162438,4023888,166236537, 921787428,48034254669,935251837851,2558696229078, 68055676507664,2655011771373417, 210067141980993186,831463105466530077, 42882922858578320598]