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A122558 as a simple table

n a(n)
0 1
1 3
2 15
3 69
4 321
5 1491
6 6927
7 32181
8 149505
9 694563
10 3226767
11 14990757
12 69643329
13 323545587
14 1503112335
15 6983086101
16 32441681409
17 150715983939
18 700188979983
19 3252903871749
20 15112182426945
21 70207441323027
22 326166312572943

[1,3,15,69,321,1491,6927,32181,149505,694563,
 3226767,14990757,69643329,323545587,1503112335,
 6983086101,32441681409,150715983939,700188979983,
 3252903871749,15112182426945,70207441323027,
 326166312572943]

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Last modified March 7 09:34 EST 2021. Contains 341869 sequences. (Running on oeis4.)