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A305645 as a simple table

na(n)
15
221
331
4137
5574
62360
713498
883190
9481377
102919477
1118188505
12111190231
13681420231
144209030021
1525916430566
16159406198332
17982241553059
186051046080917
1937258819107772
20229490403681192
211413605674151764

[5,21,31,137,574,2360,13498,83190,481377,2919477,
 18188505,111190231,681420231,4209030021,
 25916430566,159406198332,982241553059,
 6051046080917,37258819107772,229490403681192,
 1413605674151764]