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A214901 as a simple table

n a(n)
1 4
2 6
3 14
4 50
5 242
6 1682
7 13442
8 134402
9 1612802
10 22579202
11 361267202
12 6864076802
13 144145612802
14 3459494707202
15 93406357094402
16 2802190712832002
17 92472293523456002
18 3421474860367872002
19 136858994414714880002

[4,6,14,50,242,1682,13442,134402,1612802,22579202,
 361267202,6864076802,144145612802,3459494707202,
 93406357094402,2802190712832002,92472293523456002,
 3421474860367872002,136858994414714880002]

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Last modified August 4 20:00 EDT 2020. Contains 336202 sequences. (Running on oeis4.)