A197644 - OEIS

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A197644 as a simple table

n	a(n)
1	1
2	31
3	342
4	2910
5	25273
6	251972
7	2579814
8	24550379
9	230860577
10	2228487362
11	21701017288
12	209232791158
13	2007839656980
14	19335726884633
15	186641182758431
16	1799468819059552
17	17330304902080402
18	166963816148786657

[1,31,342,2910,25273,251972,2579814,24550379, 230860577,2228487362,21701017288,209232791158, 2007839656980,19335726884633,186641182758431, 1799468819059552,17330304902080402, 166963816148786657]