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A018103 as a simple table

na(n)
01
12
24
39
420
542
689
7189
8400
9846
101789
113783
128000
1316918
1435777
1575659
16160000
17338359
18715542
191513187
203200000
216767176
2214310835
2330263731
2464000000
25135343522
26286216701
27605274630
281280000000

[1,2,4,9,20,42,89,189,400,846,1789,3783,8000,
 16918,35777,75659,160000,338359,715542,1513187,
 3200000,6767176,14310835,30263731,64000000,
 135343522,286216701,605274630,1280000000]