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A157591 as a simple table

na(n)
21
33
4354
535410
63079815
7254391501
820017977868
91645049437956
10130713839323245
119274041450918255
12602446992143570574
1336862449524697504786
142161188475320550751257
15122528449769743353508305

[1,3,354,35410,3079815,254391501,20017977868,
 1645049437956,130713839323245,9274041450918255,
 602446992143570574,36862449524697504786,
 2161188475320550751257,122528449769743353508305]