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A188818 as a simple table

na(n)
01
12
29
348
4256
51360
67056
736000
8179776
9884256
104276624
1120432608
1296353856
13449990080
142080089664
159540782208
1643403888896
17196212020800
18881112632976
193936117388896
2017487049789504
2177350773736512
22340574032803904
231493986588951168
246528047911024896

[1,2,9,48,256,1360,7056,36000,179776,884256,
 4276624,20432608,96353856,449990080,2080089664,
 9540782208,43403888896,196212020800,881112632976,
 3936117388896,17487049789504,77350773736512,
 340574032803904,1493986588951168,6528047911024896]