A145967 - OEIS

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A145967 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	3
7	8
8	27
9	89
10	333
11	1310
12	7293
13	48975
14	401989
15	3756663
16	40465266
17	497724568
18	7379658407
19	131602632698
20	2820564955461
21	71452077409468
22	2129247440397929
23	74391175132817461
24	3073387865714226226

[1,1,1,1,1,3,8,27,89,333,1310,7293,48975,401989, 3756663,40465266,497724568,7379658407, 131602632698,2820564955461,71452077409468, 2129247440397929,74391175132817461, 3073387865714226226]