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A001791 as a simple table

n a(n)
0 0
1 1
2 4
3 15
4 56
5 210
6 792
7 3003
8 11440
9 43758
10 167960
11 646646
12 2496144
13 9657700
14 37442160
15 145422675
16 565722720
17 2203961430
18 8597496600
19 33578000610
20 131282408400
21 513791607420
22 2012616400080
23 7890371113950
24 30957699535776
25 121548660036300
26 477551179875952

[0,1,4,15,56,210,792,3003,11440,43758,167960,
 646646,2496144,9657700,37442160,145422675,
 565722720,2203961430,8597496600,33578000610,
 131282408400,513791607420,2012616400080,
 7890371113950,30957699535776,121548660036300,
 477551179875952]

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Last modified May 26 23:16 EDT 2018. Contains 304689 sequences. (Running on oeis4.)