A002918 - OEIS

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A002918 as a simple table

n	a(n)
0	6
1	48
2	390
3	3216
4	26844
5	229584
6	2006736
7	17809008
8	159799812
9	1446245424
10	13181330772
11	120849559824
12	1113598633188

[6,48,390,3216,26844,229584,2006736,17809008, 159799812,1446245424,13181330772,120849559824, 1113598633188]