A053908 - OEIS

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A053908 as a simple table

n	a(n)
1	1
2	4
3	9
4	41
5	109
6	1291
7	28604
8	78541
9	81619
10	782104
11	1054119
12	3341881
13	4345881
14	25823791
15	29439546
16	129105041
17	817851954
18	931064546
19	2486185454
20	2609955204
21	24862847104
22	786680914454

[1,4,9,41,109,1291,28604,78541,81619,782104, 1054119,3341881,4345881,25823791,29439546, 129105041,817851954,931064546,2486185454, 2609955204,24862847104,786680914454]