A053708 - OEIS

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A053708 as a simple table

n	a(n)
1	2
2	3
3	5
4	23
5	113
6	719
7	5039
8	40343
9	362867
10	3628789
11	39916801
12	479001599
13	6227020777
14	87178291199
15	1307674368043
16	20922789888023
17	355687428096031
18	6402373705728037
19	121645100408832089
20	2432902008176640029

[2,3,5,23,113,719,5039,40343,362867,3628789, 39916801,479001599,6227020777,87178291199, 1307674368043,20922789888023,355687428096031, 6402373705728037,121645100408832089, 2432902008176640029]