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A022553 as a simple table

n a(n)
0 1
1 1
2 1
3 3
4 8
5 25
6 75
7 245
8 800
9 2700
10 9225
11 32065
12 112632
13 400023
14 1432613
15 5170575
16 18783360
17 68635477
18 252085716
19 930138521
20 3446158600
21 12815663595
22 47820414961
23 178987624513
24 671825020128
25 2528212128750
26 9536894664375
27 36054433807398
28 136583760011496

[1,1,1,3,8,25,75,245,800,2700,9225,32065,112632,
 400023,1432613,5170575,18783360,68635477,
 252085716,930138521,3446158600,12815663595,
 47820414961,178987624513,671825020128,
 2528212128750,9536894664375,36054433807398,
 136583760011496]

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Last modified February 22 21:55 EST 2018. Contains 299469 sequences. (Running on oeis4.)