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A278722 as a simple table

na(n)
120
2275
33232
433466
5306070
62487889
718151220
8120104810
9727684612
104070893254
1121181152380
12103146867706
13472709673984
142048611972127
158431440391174
1633079800818118
17124138709933301
18446936241587393

[20,275,3232,33466,306070,2487889,18151220,
 120104810,727684612,4070893254,21181152380,
 103146867706,472709673984,2048611972127,
 8431440391174,33079800818118,124138709933301,
 446936241587393]