A045983 - OEIS

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A045983 as a simple table

n	a(n)
1	1
2	2
3	2
4	2
5	54
6	91
7	141
8	141
9	44360
10	48919
11	218972
12	526095
13	526095
14	526095
15	17233173
16	127890362
17	29138958036
18	118968284928
19	118968284928
20	585927201062
21	585927201062
22	585927201062
23	585927201062

[1,2,2,2,54,91,141,141,44360,48919,218972,526095, 526095,526095,17233173,127890362,29138958036, 118968284928,118968284928,585927201062, 585927201062,585927201062,585927201062]