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A006253 as a simple table

na(n)
01
12
29
332
4121
5450
61681
76272
823409
987362
10326041
111216800
124541161
1316947842
1463250209
15236052992
16880961761
173287794050
1812270214441
1945793063712
20170902040409
21637815097922
222380358351281
238883618307200
2433154114877521
25123732841202882

[1,2,9,32,121,450,1681,6272,23409,87362,326041,
 1216800,4541161,16947842,63250209,236052992,
 880961761,3287794050,12270214441,45793063712,
 170902040409,637815097922,2380358351281,
 8883618307200,33154114877521,123732841202882]