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A325790 as a simple table

na(n)
01
11
22
36
416
5100
6492
71764
88592
971208
10395520
111679480
129313128
1372154030
14420375872
151625653650

[1,1,2,6,16,100,492,1764,8592,71208,395520,
 1679480,9313128,72154030,420375872,1625653650]