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A301821 as a simple table

na(n)
15
250
3278
41351
56501
631061
7147954
8705180
93364845
1016066957
1176746541
12366661633
131751917453
148371075480
1539999735173
16191133225006
17913306286525
184364124497569
1920853452368747
2099645765475503
21476145569567504

[5,50,278,1351,6501,31061,147954,705180,3364845,
 16066957,76746541,366661633,1751917453,8371075480,
 39999735173,191133225006,913306286525,
 4364124497569,20853452368747,99645765475503,
 476145569567504]