A012812 - OEIS

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A012812 as a simple table

n	a(n)
0	1
1	1
2	9
3	345
4	14833
5	1493265
6	158895033
7	30935964969
8	6150088646497
9	1967749424641953
10	629235472952720105
11	300014790466799113849
12	140704010339485622390865
13	93651237671421167849769905

[1,1,9,345,14833,1493265,158895033,30935964969, 6150088646497,1967749424641953,629235472952720105, 300014790466799113849,140704010339485622390865, 93651237671421167849769905]