A127940 - OEIS

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A127940 as a simple table

n	a(n)
1	1
2	1
3	1
4	2
5	3
6	8
7	22
8	71
9	93
10	638
11	9144
12	26821
13	2373690
14	11013191
15	950468551
16	23819080360
17	4860600739719
18	18887557655957
19	23748158395676
20	102452785866447
21	1153981434332852712
22	722919835385951370578

[1,1,1,2,3,8,22,71,93,638,9144,26821,2373690, 11013191,950468551,23819080360,4860600739719, 18887557655957,23748158395676,102452785866447, 1153981434332852712,722919835385951370578]