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A221487 as a simple table

na(n)
10
2256
31980
4865318
548514602
66681667775
7579209730382
863151886490539
96122578678693488
10629811753399775239

[0,256,1980,865318,48514602,6681667775,
 579209730382,63151886490539,6122578678693488,
 629811753399775239]