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A032123 as a simple table

n a(n)
0 1
1 1
2 4
3 10
4 38
5 126
6 472
7 1716
8 6470
9 24310
10 92504
11 352716
12 1352540
13 5200300
14 20060016
15 77558760
16 300546630
17 1166803110
18 4537591960
19 17672631900
20 68923356788
21 269128937220
22 1052049834576
23 4116715363800

[1,1,4,10,38,126,472,1716,6470,24310,92504,352716,
 1352540,5200300,20060016,77558760,300546630,
 1166803110,4537591960,17672631900,68923356788,
 269128937220,1052049834576,4116715363800]

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Last modified October 22 18:55 EDT 2018. Contains 316500 sequences. (Running on oeis4.)