A145758 - OEIS

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A145758 as a simple table

n	a(n)
1	1
2	1
3	7
4	3
5	46
6	11
7	1486
8	401
9	133777
10	19881
11	31874678
12	3357350
13	19385116046
14	1369262857
15	34450358764096
16	1726253429208
17	166321294438234974
18	5602768757076743
19	2202194423758663223078
20	51308572928072165575

[1,1,7,3,46,11,1486,401,133777,19881,31874678, 3357350,19385116046,1369262857,34450358764096, 1726253429208,166321294438234974,5602768757076743, 2202194423758663223078,51308572928072165575]