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A056400 as a simple table

na(n)
10
20
30
40
50
61
74
883
9454
105761
1117998
12334797
13777107
1410574995
1552611728
16342199022
171094122103
1818448004619
1938504610244
20538330833767
212215487105217
2216330536710131
2345407723468330

[0,0,0,0,0,1,4,83,454,5761,17998,334797,777107,
 10574995,52611728,342199022,1094122103,
 18448004619,38504610244,538330833767,
 2215487105217,16330536710131,45407723468330]