A003917 - OEIS

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A003917 as a simple table

n	a(n)
1	1
2	2480
3	2480
4	45694
5	48174
6	48174
7	120064
8	120064
9	381766
10	1152735
11	1534500
12	3028266
13	3073960
14	4226695
15	4997664
16	5379430
17	10758860
18	11834746
19	16906780
20	18395586
21	18395586
22	18395586
23	19212250

[1,2480,2480,45694,48174,48174,120064,120064, 381766,1152735,1534500,3028266,3073960,4226695, 4997664,5379430,10758860,11834746,16906780, 18395586,18395586,18395586,19212250]