A015806 - OEIS

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A015806 as a simple table

n	a(n)
1	175
2	220
3	350
4	752
5	3772
6	4720
7	5092
8	15296
9	80320
10	269872
11	632752
12	807650
13	1126672
14	1304320
15	4176896
16	4386476
17	20945920
18	37030556
19	1073463296
20	17178755072
21	34796530432
22	85897707520
23	274873450496

[175,220,350,752,3772,4720,5092,15296,80320, 269872,632752,807650,1126672,1304320,4176896, 4386476,20945920,37030556,1073463296,17178755072, 34796530432,85897707520,274873450496]