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A217716 as a simple table

n a(n)
0 2
1 4
2 12
3 64
4 700
5 17424
6 1053696
7 160579584
8 62856336636
9 63812936890000
10 168895157342195152
11 1169048914836855865344
12 21209591746609937928524800
13 1010490883477487017627972550656
14 126641164340871500483202065902080000

[2,4,12,64,700,17424,1053696,160579584,
 62856336636,63812936890000,168895157342195152,
 1169048914836855865344,21209591746609937928524800,
 1010490883477487017627972550656,
 126641164340871500483202065902080000]

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Last modified April 23 03:30 EDT 2024. Contains 371906 sequences. (Running on oeis4.)