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A271240 as a simple table

na(n)
10
20
327
43969
5900963
6401227533
7378139318893
8781827640754454
93616937252790336657
1037896435473683175186868
11906454150918706470312961064
1249772528444719473909687286111017
136299004718478220148511987214265415811

[0,0,27,3969,900963,401227533,378139318893,
 781827640754454,3616937252790336657,
 37896435473683175186868,
 906454150918706470312961064,
 49772528444719473909687286111017,
 6299004718478220148511987214265415811]