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A240989 as a simple table

n a(n)
0 1
1 0
2 0
3 6
4 12
5 20
6 390
7 2562
8 11816
9 105912
10 1063530
11 8815070
12 81342492
13 895185876
14 9971185406
15 112642410090
16 1372455608400
17 17750397057392
18 236950003516626
19 3286258330135734
20 47688868443593540
21 719345273005797900
22 11222288509573985382
23 181168865439054099266

[1,0,0,6,12,20,390,2562,11816,105912,1063530,
 8815070,81342492,895185876,9971185406,
 112642410090,1372455608400,17750397057392,
 236950003516626,3286258330135734,
 47688868443593540,719345273005797900,
 11222288509573985382,181168865439054099266]

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Last modified September 5 00:56 EDT 2024. Contains 375685 sequences. (Running on oeis4.)