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A188491 as a simple table

na(n)
00
11
22
36
414
548
6152
7476
81425
94340
1013288
1140852
12125124
13382888
141171612
153587505
1610985790
1733638142
18102988410
19315318756
20965432832
212955964296
229050522241
2327710613432
2484843476928
25259771465608
26795361704776
272435217884992

[0,1,2,6,14,48,152,476,1425,4340,13288,40852,
 125124,382888,1171612,3587505,10985790,33638142,
 102988410,315318756,965432832,2955964296,
 9050522241,27710613432,84843476928,259771465608,
 795361704776,2435217884992]