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A277476 as a simple table

n a(n)
0 0
1 0
2 2
3 6
4 40
5 340
6 3936
7 56714
8 976704
9 19535688
10 444743680
11 11349643822
12 320813048832
13 9947821243100
14 335700998830848
15 12246806941654770
16 480247532548624384
17 20144008859005187344
18 899923326921333301248
19 42658767419625168409814
20 2138475182252830504796160

[0,0,2,6,40,340,3936,56714,976704,19535688,
 444743680,11349643822,320813048832,9947821243100,
 335700998830848,12246806941654770,
 480247532548624384,20144008859005187344,
 899923326921333301248,42658767419625168409814,
 2138475182252830504796160]

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Last modified October 25 20:31 EDT 2021. Contains 348256 sequences. (Running on oeis4.)