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A318529 as a simple table

na(n)
11
21
31
4242
53624
622020
7671346
88870024
949250144
10463239475
111407472722
1282462576220
1382462576220
145907695879319

[1,1,1,242,3624,22020,671346,8870024,49250144,
 463239475,1407472722,82462576220,82462576220,
 5907695879319]