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A257589 as a simple table

n a(n)
0 1
1 9
2 50
3 245
4 1134
5 5082
6 22308
7 96525
8 413270
9 1755182
10 7407036
11 31097794
12 130007500
13 541574100
14 2249204040
15 9316746045
16 38504502630
17 158814867750
18 653887380300
19 2688007311990
20 11034286426020
21 45238127719980
22 185252191371000

[1,9,50,245,1134,5082,22308,96525,413270,1755182,
 7407036,31097794,130007500,541574100,2249204040,
 9316746045,38504502630,158814867750,653887380300,
 2688007311990,11034286426020,45238127719980,
 185252191371000]

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Last modified May 23 11:20 EDT 2019. Contains 323514 sequences. (Running on oeis4.)