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A056410 as a simple table

na(n)
10
20
30
40
50
61
74
883
9454
105761
1117998
12334796
13777107
1410574991
1552611728
16342198939
171094122103
1818448004164
1938504610244
20538330828006
212215487105213
2216330536692133
2345407723468330

[0,0,0,0,0,1,4,83,454,5761,17998,334796,777107,
 10574991,52611728,342198939,1094122103,
 18448004164,38504610244,538330828006,
 2215487105213,16330536692133,45407723468330]