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A278360 as a simple table

na(n)
120
2281
33183
434038
5366982
64058169
744208465
8451571539
94213513472
1035702217342
11275765596545
121955472740426
1312826024056862
1478357459733281
15448627173302773
162420105832394544
1712358148308045511
1859981333718872012

[20,281,3183,34038,366982,4058169,44208465,
 451571539,4213513472,35702217342,275765596545,
 1955472740426,12826024056862,78357459733281,
 448627173302773,2420105832394544,
 12358148308045511,59981333718872012]