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A283631 as a simple table

na(n)
12
288
32875
461592
51185010
620051838
7317384829
84754748994
968462751532
10955500406758
1113010041583954
12173616639167456
132278616911473726
1429489304434111462
15377108880886712165
164772989815120393198

[2,88,2875,61592,1185010,20051838,317384829,
 4754748994,68462751532,955500406758,
 13010041583954,173616639167456,2278616911473726,
 29489304434111462,377108880886712165,
 4772989815120393198]