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A126673 as a simple table

n a(n)
2 0
3 2
4 26
5 274
6 2844
7 30708
8 351504
9 4292496
10 55988640
11 779171040
12 11545476480
13 181705299840
14 3029581820160
15 53376951801600
16 991337037465600
17 19363464423475200
18 396915849843609600
19 8520964324004966400
20 191220598650009600000
21 4477883953203763200000
22 109242544826541772800000

[0,2,26,274,2844,30708,351504,4292496,55988640,
 779171040,11545476480,181705299840,3029581820160,
 53376951801600,991337037465600,19363464423475200,
 396915849843609600,8520964324004966400,
 191220598650009600000,4477883953203763200000,
 109242544826541772800000]

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Last modified April 17 16:12 EDT 2021. Contains 343063 sequences. (Running on oeis4.)