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A221259 as a simple table

na(n)
10
2256
3418
41612900
578633756
622466712321
72294073688498
8399487764096100
951031822108216122
107730096571419434884
111061888266253693915768
12154122481474602369093121
1321681358901642544133423968

[0,256,418,1612900,78633756,22466712321,
 2294073688498,399487764096100,51031822108216122,
 7730096571419434884,1061888266253693915768,
 154122481474602369093121,
 21681358901642544133423968]