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A081190 as a simple table

na(n)
01
18
265
3536
44481
537928
6324545
72803256
824405761
9213887048
101884629825
1116679193176
12148135411841
131319377419368
1411777507763905
15105319346802296
16943126559710721
178454906106826888
1875861524447454785
19681125306429182616

[1,8,65,536,4481,37928,324545,2803256,24405761,
 213887048,1884629825,16679193176,148135411841,
 1319377419368,11777507763905,105319346802296,
 943126559710721,8454906106826888,
 75861524447454785,681125306429182616]