A147468 - OEIS

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A147468 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	57
10	101
11	607
12	1089
13	8859
14	19351
15	240245
16	590155
17	24829301
18	73370321
19	4764846299
20	16592732065
21	1205158717385
22	4890998445663
23	529813293025221
24	2499121025302115
25	491892443613075873

[1,1,1,1,1,1,1,1,57,101,607,1089,8859,19351, 240245,590155,24829301,73370321,4764846299, 16592732065,1205158717385,4890998445663, 529813293025221,2499121025302115, 491892443613075873]