A224125 - OEIS

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A224125 as a simple table

n	a(n)
1	20
2	1080
3	47059
4	1703178
5	53355889
6	1491827492
7	38051383139
8	899713542225
9	19963535397227
10	419672473818646
11	8421847090410941
12	162325525523034609
13	3020162740527368685
14	54468878788851494328
15	955569173872191005683

[20,1080,47059,1703178,53355889,1491827492, 38051383139,899713542225,19963535397227, 419672473818646,8421847090410941, 162325525523034609,3020162740527368685, 54468878788851494328,955569173872191005683]