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A076687 as a simple table

n a(n)
0 1
1 0
2 2
3 0
4 8
5 16
6 96
7 464
8 2848
9 19056
10 142400
11 1166608
12 10411488
13 100496816
14 1043154304
15 11585854032
16 137089725728
17 1721562067696
18 22867314748608
19 320313336833936
20 4718773157942368
21 72932090897154096
22 1180003546791130112
23 19945632339806733520
24 351569488641977570208

[1,0,2,0,8,16,96,464,2848,19056,142400,1166608,
 10411488,100496816,1043154304,11585854032,
 137089725728,1721562067696,22867314748608,
 320313336833936,4718773157942368,
 72932090897154096,1180003546791130112,
 19945632339806733520,351569488641977570208]

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Last modified May 7 13:48 EDT 2024. Contains 372303 sequences. (Running on oeis4.)