A370464 - OEIS

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A370464 as a simple table

n	a(n)
0	1
1	1
2	1
3	3
4	9
5	4
6	25
7	277
8	162
9	48
10	543
11	38409
12	18136
13	6912
14	1536
15	29281
16	23169481
17	7195590
18	2346000
19	691200
20	122880

[1,1,1,3,9,4,25,277,162,48,543,38409,18136,6912, 1536,29281,23169481,7195590,2346000,691200,122880]