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A183399 as a simple table

n a(n)
1 4
2 2
3 6
4 32
5 110
6 450
7 1680
8 6498
9 24794
10 95048
11 364030
12 1394450
13 5342640
14 20467202
15 78415506
16 300419072
17 1150965830
18 4409544050
19 16893761040
20 64722982898
21 247965235594
22 949998793608
23 3639613683310
24 13944005214050
25 53421954623280

[4,2,6,32,110,450,1680,6498,24794,95048,364030,
 1394450,5342640,20467202,78415506,300419072,
 1150965830,4409544050,16893761040,64722982898,
 247965235594,949998793608,3639613683310,
 13944005214050,53421954623280]

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Last modified August 17 03:44 EDT 2022. Contains 356181 sequences. (Running on oeis4.)