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A051489 as a simple table

na(n)
01
14
232
3368
45392
594932
61941760
745136576
81173741824
933739007300
101061917364224
1136314872537968
121340612376924160
1353132088082450132
142250010931847299072
15101388548387203175168
164843806013966239465472

[1,4,32,368,5392,94932,1941760,45136576,
 1173741824,33739007300,1061917364224,
 36314872537968,1340612376924160,53132088082450132,
 2250010931847299072,101388548387203175168,
 4843806013966239465472]