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A081559 as a simple table

na(n)
01
14
264
31984
497024
56713344
6615829504
771654785024
810243143368704
91755968011239424
10354197952894337024
1182788022987201183744
1222140953727834378993664
136703959915806302859689984
142277487386474356139699994624
15861378969099073547571187154944

[1,4,64,1984,97024,6713344,615829504,71654785024,
 10243143368704,1755968011239424,
 354197952894337024,82788022987201183744,
 22140953727834378993664,6703959915806302859689984,
 2277487386474356139699994624,
 861378969099073547571187154944]