A059411 - OEIS

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A059411 as a simple table

n	a(n)
1	2
2	5
3	11
4	23
5	47
6	283
7	1699
8	20389
9	244669
10	7340071
11	205521989
12	411043979
13	4932527749
14	295951664941
15	4735226639057
16	227290878674737
17	12273707448435799
18	883706936287377529
19	24743794216046570813

[2,5,11,23,47,283,1699,20389,244669,7340071, 205521989,411043979,4932527749,295951664941, 4735226639057,227290878674737,12273707448435799, 883706936287377529,24743794216046570813]