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A001819 as a simple table

n a(n)
0 0
1 1
2 5
3 49
4 820
5 21076
6 773136
7 38402064
8 2483133696
9 202759531776
10 20407635072000
11 2482492033152000
12 359072203696128000
13 60912644957448192000
14 11977654199703478272000
15 2702572249389834608640000

[0,1,5,49,820,21076,773136,38402064,2483133696,
 202759531776,20407635072000,2482492033152000,
 359072203696128000,60912644957448192000,
 11977654199703478272000,2702572249389834608640000]

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Last modified April 18 20:26 EDT 2024. Contains 371781 sequences. (Running on oeis4.)