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A000279 as a simple table

n a(n)
1 3
2 24
3 216
4 1824
5 15150
6 124416
7 1014888
8 8241792
9 66724398
10 538990800
11 4346692680
12 35009591040
13 281699380560
14 2264868936960
15 18198009147600
16 146142982814208
17 1173123636533454
18 9413509300965936
19 75513633110271264
20 605598295606296000
21 4855626127979443908
22 38924245740546950784

[3,24,216,1824,15150,124416,1014888,8241792,
 66724398,538990800,4346692680,35009591040,
 281699380560,2264868936960,18198009147600,
 146142982814208,1173123636533454,9413509300965936,
 75513633110271264,605598295606296000,
 4855626127979443908,38924245740546950784]

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Last modified December 4 11:13 EST 2016. Contains 278750 sequences.