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A227438 as a simple table

n a(n)
1 4
2 16
3 62
4 240
5 932
6 3620
7 14056
8 54576
9 211912
10 822832
11 3194960
12 12405648
13 48169664
14 187037120
15 726243040
16 2819915904
17 10949400256
18 42515227456
19 165081604736
20 640992365568
21 2488897617536
22 9664095367424
23 37524540428032

[4,16,62,240,932,3620,14056,54576,211912,822832,
 3194960,12405648,48169664,187037120,726243040,
 2819915904,10949400256,42515227456,165081604736,
 640992365568,2488897617536,9664095367424,
 37524540428032]

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Last modified December 1 18:55 EST 2022. Contains 358475 sequences. (Running on oeis4.)