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A001075 as a simple table

na(n)
01
12
27
326
497
5362
61351
75042
818817
970226
10262087
11978122
123650401
1313623482
1450843527
15189750626
16708158977
172642885282
189863382151
1936810643322
20137379191137
21512706121226
221913445293767
237141075053842
2426650854921601
2599462344632562
26371198523608647

[1,2,7,26,97,362,1351,5042,18817,70226,262087,
 978122,3650401,13623482,50843527,189750626,
 708158977,2642885282,9863382151,36810643322,
 137379191137,512706121226,1913445293767,
 7141075053842,26650854921601,99462344632562,
 371198523608647]