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A222508 as a simple table

na(n)
15
244
3441
48489
581537
61802656
719892241
8473772613
95455705052
10132847734428
111556509083100
1238249750511090
13451888833065131
1411163258877769638
15132555800154675325
163286688523503328223
1739169490256183059057

[5,44,441,8489,81537,1802656,19892241,473772613,
 5455705052,132847734428,1556509083100,
 38249750511090,451888833065131,11163258877769638,
 132555800154675325,3286688523503328223,
 39169490256183059057]