A346796 - OEIS

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A346796 as a simple table

n	a(n)
1	0
2	2
3	22
4	180
5	1340
6	9622
7	68082
8	478760
9	3357880
10	23524842
11	164732942
12	1153307740
13	8073685620
14	56517393662
15	395626538602
16	2769400119120
17	19385843880560
18	135701036304082
19	949907641549062
20	6649354653104900

[0,2,22,180,1340,9622,68082,478760,3357880, 23524842,164732942,1153307740,8073685620, 56517393662,395626538602,2769400119120, 19385843880560,135701036304082,949907641549062, 6649354653104900]