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A103771 as a simple table

n a(n)
0 1
1 4
2 20
3 100
4 496
5 2464
6 12240
7 60800
8 302016
9 1500224
10 7452160
11 37017600
12 183879936
13 913398784
14 4537185280
15 22537856000
16 111953760256
17 556115206144
18 2762427289600
19 13721985024000
20 68162110078976
21 338586089570304

[1,4,20,100,496,2464,12240,60800,302016,1500224,
 7452160,37017600,183879936,913398784,4537185280,
 22537856000,111953760256,556115206144,
 2762427289600,13721985024000,68162110078976,
 338586089570304]

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Last modified August 15 13:27 EDT 2020. Contains 336504 sequences. (Running on oeis4.)