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A222913 as a simple table

n a(n)
1 0
2 6
3 18
4 136
5 654
6 3972
7 21778
8 127226
9 727214
10 4237154
11 24617576
12 144049162
13 843945398
14 4961892900
15 29226194746
16 172530718840
17 1020187713214
18 6042341555988
19 35837121558046
20 212824919490178
21 1265353059527832

[0,6,18,136,654,3972,21778,127226,727214,4237154,
 24617576,144049162,843945398,4961892900,
 29226194746,172530718840,1020187713214,
 6042341555988,35837121558046,212824919490178,
 1265353059527832]

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Last modified May 29 05:33 EDT 2024. Contains 372921 sequences. (Running on oeis4.)