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A269673 as a simple table

n a(n)
1 4
2 16
3 60
4 224
5 820
6 2976
7 10700
8 38224
9 135780
10 480176
11 1691740
12 5941824
13 20814740
14 72755776
15 253836780
16 884207024
17 3075861700
18 10687549776
19 37098781820
20 128668433824
21 445930140660
22 1544500542176
23 5346546062860
24 18499277662224

[4,16,60,224,820,2976,10700,38224,135780,480176,
 1691740,5941824,20814740,72755776,253836780,
 884207024,3075861700,10687549776,37098781820,
 128668433824,445930140660,1544500542176,
 5346546062860,18499277662224]

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Last modified May 30 06:59 EDT 2024. Contains 372962 sequences. (Running on oeis4.)