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A123281 as a simple table

na(n)
11
21
31
45
519
6205
71795
836317
9636331
1023679901
11805351531
1256294206205
133735873535339
14502757743028605
1565725984337422795
1617309316971673776957
174485620580863732681131

[1,1,1,5,19,205,1795,36317,636331,23679901,
 805351531,56294206205,3735873535339,
 502757743028605,65725984337422795,
 17309316971673776957,4485620580863732681131]