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A280282 as a simple table

na(n)
18
22894
3259040
418844474
51240628942
677217209188
74633270354464
8270955366695864
915546377295977053
10878972943594068704
1149118677321905379365
122718859223224974395528
13149313335035761869484749

[8,2894,259040,18844474,1240628942,77217209188,
 4633270354464,270955366695864,15546377295977053,
 878972943594068704,49118677321905379365,
 2718859223224974395528,149313335035761869484749]