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A059357 as a simple table

na(n)
31
418
5215
62475
728294
8340116
94335596
1057773700
11831170736
1212532005288
13201002619168
143401283910752
1560929911689984
161143429812726400
1722572470529457920
18468013463441475840
1910124124979606179840

[1,18,215,2475,28294,340116,4335596,57773700,
 831170736,12532005288,201002619168,3401283910752,
 60929911689984,1143429812726400,22572470529457920,
 468013463441475840,10124124979606179840]