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A187251 as a simple table

na(n)
01
11
22
36
422
594
6460
72532
815420
9102620
10739512
115729192
1247429896
13417429800
143888426512
1538192416048
16394239339792
174264424937488
1848212317486112
19568395755184224
206973300915138656
2188860103591344864
221174131206436335296
2316061756166912244800

[1,1,2,6,22,94,460,2532,15420,102620,739512,
 5729192,47429896,417429800,3888426512,38192416048,
 394239339792,4264424937488,48212317486112,
 568395755184224,6973300915138656,
 88860103591344864,1174131206436335296,
 16061756166912244800]