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A278015 as a simple table

n a(n)
1 0
2 6
3 28
4 168
5 960
6 5530
7 31808
8 183000
9 1052800
10 6056806
11 34845028
12 200464768
13 1153281360
14 6634871130
15 38170663608
16 219597266000
17 1263351345600
18 7268107893606
19 41813698570028
20 240555783389368
21 1383926485841760

[0,6,28,168,960,5530,31808,183000,1052800,6056806,
 34845028,200464768,1153281360,6634871130,
 38170663608,219597266000,1263351345600,
 7268107893606,41813698570028,240555783389368,
 1383926485841760]

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Last modified May 24 21:58 EDT 2022. Contains 354043 sequences. (Running on oeis4.)