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A075511 as a simple table

na(n)
01
142
21064
321168
4365232
55743584
684713728
71193127936
816239711488
9215394955776
102800564795392
1135851775791104
12453374980255744
135677724481773568
1470550796621971456
15871159544637161472

[1,42,1064,21168,365232,5743584,84713728,
 1193127936,16239711488,215394955776,2800564795392,
 35851775791104,453374980255744,5677724481773568,
 70550796621971456,871159544637161472]