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A294593 as a simple table

na(n)
10
21
32
46
522
688
7372
81636
97406
1034276
11161436
12771238
133728168
1418201830
1589622696
16444533010
172219057382
1811139859864
1956203325212
20284828848740
211449270351504

[0,1,2,6,22,88,372,1636,7406,34276,161436,771238,
 3728168,18201830,89622696,444533010,2219057382,
 11139859864,56203325212,284828848740,
 1449270351504]