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A221722 as a simple table

na(n)
121
23605
3544757
481980587
512325049264
61852447247829
7278394265759168
841836968289680535
96287169859547251975
10944818763789937611918
11141984605326159531366196
1221337022505681038084244109

[21,3605,544757,81980587,12325049264,
 1852447247829,278394265759168,41836968289680535,
 6287169859547251975,944818763789937611918,
 141984605326159531366196,
 21337022505681038084244109]