A125275 - OEIS

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A125275 as a simple table

n	a(n)
0	1
1	1
2	2
3	7
4	31
5	162
6	968
7	6481
8	47893
9	386098
10	3364562
11	31460324
12	313743665
13	3320211313
14	37124987124
15	436985496790
16	5397178181290
17	69748452377058
18	940762812167126
19	13213888481979449
20	192891251215160017

[1,1,2,7,31,162,968,6481,47893,386098,3364562, 31460324,313743665,3320211313,37124987124, 436985496790,5397178181290,69748452377058, 940762812167126,13213888481979449, 192891251215160017]