A370609 - OEIS

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A370609 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	4
6	3
7	1
8	11
9	40
10	12
11	1
12	26
13	280
14	657
15	60
16	1
17	57
18	1491
19	13447
20	17412
21	360
22	1
23	120
24	6930
25	178297
26	1127388
27	781896
28	2520

[1,1,1,1,4,3,1,11,40,12,1,26,280,657,60,1,57,1491, 13447,17412,360,1,120,6930,178297,1127388,781896, 2520]