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A270099 as a simple table

n a(n)
0 1
1 4
2 40
3 196
4 844
5 3532
6 14784
7 60248
8 242792
9 977020
10 3920112
11 15702644
12 62855916
13 251527896
14 1006303768
15 4025613088

[1,4,40,196,844,3532,14784,60248,242792,977020,
 3920112,15702644,62855916,251527896,1006303768,
 4025613088]

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Last modified August 2 02:53 EDT 2021. Contains 346409 sequences. (Running on oeis4.)