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A105481 as a simple table

na(n)
51
65
730
8175
91050
106552
1142630
12289410
132049300
1415120105
15116090975
16926248050
177668746540
1865793760060
19584151925320
205360347320420
2150776288702215
22495946245776940
234989391837053085
2451648932225779735
25549620905409062872

[1,5,30,175,1050,6552,42630,289410,2049300,
 15120105,116090975,926248050,7668746540,
 65793760060,584151925320,5360347320420,
 50776288702215,495946245776940,4989391837053085,
 51648932225779735,549620905409062872]