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A217855 as a simple table

n a(n)
0 0
1 2
2 30
3 420
4 5852
5 81510
6 1135290
7 15812552
8 220240440
9 3067553610
10 42725510102
11 595089587820
12 8288528719380
13 115444312483502
14 1607931846049650
15 22395601532211600
16 311930489604912752
17 4344631252936566930
18 60512907051507024270
19 842836067468161772852

[0,2,30,420,5852,81510,1135290,15812552,220240440,
 3067553610,42725510102,595089587820,8288528719380,
 115444312483502,1607931846049650,
 22395601532211600,311930489604912752,
 4344631252936566930,60512907051507024270,
 842836067468161772852]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)