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A005319 as a simple table

n a(n)
0 0
1 4
2 24
3 140
4 816
5 4756
6 27720
7 161564
8 941664
9 5488420
10 31988856
11 186444716
12 1086679440
13 6333631924
14 36915112104
15 215157040700
16 1254027132096
17 7309005751876
18 42600007379160
19 248291038523084
20 1447146223759344
21 8434586304032980

[0,4,24,140,816,4756,27720,161564,941664,5488420,
 31988856,186444716,1086679440,6333631924,
 36915112104,215157040700,1254027132096,
 7309005751876,42600007379160,248291038523084,
 1447146223759344,8434586304032980]

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Last modified August 18 17:55 EDT 2018. Contains 313834 sequences. (Running on oeis4.)