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A209298 as a simple table

n a(n)
0 1
1 1
2 0
3 4
4 6
5 30
6 348
7 1580
8 12516
9 114884
10 1375776
11 12239280
12 160067160
13 1966619512
14 28104385008
15 428735710000
16 6769181533968
17 110402248461840
18 2070626881211136
19 38342125010072384
20 764180537501729376
21 16185744192232110560
22 354756690964676468160

[1,1,0,4,6,30,348,1580,12516,114884,1375776,
 12239280,160067160,1966619512,28104385008,
 428735710000,6769181533968,110402248461840,
 2070626881211136,38342125010072384,
 764180537501729376,16185744192232110560,
 354756690964676468160]

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Last modified April 22 00:17 EDT 2024. Contains 371886 sequences. (Running on oeis4.)