A147419 - OEIS

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A147419 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	8
9	17
10	36
11	53
12	124
13	323
14	1007
15	2889
16	11702
17	39960
18	173688
19	672545
20	3448944
21	15619066
22	95906062
23	522271313
24	3756284779
25	24152062634

[1,1,1,1,1,1,3,8,17,36,53,124,323,1007,2889,11702, 39960,173688,672545,3448944,15619066,95906062, 522271313,3756284779,24152062634]