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A006480 as a simple table

n a(n)
0 1
1 6
2 90
3 1680
4 34650
5 756756
6 17153136
7 399072960
8 9465511770
9 227873431500
10 5550996791340
11 136526995463040
12 3384731762521200
13 84478098072866400
14 2120572665910728000
15 53494979785374631680
16 1355345464406015082330
17 34469858696831179429500
18 879619727485803060256500
19 22514366432046593564460000

[1,6,90,1680,34650,756756,17153136,399072960,
 9465511770,227873431500,5550996791340,
 136526995463040,3384731762521200,
 84478098072866400,2120572665910728000,
 53494979785374631680,1355345464406015082330,
 34469858696831179429500,879619727485803060256500,
 22514366432046593564460000]

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Last modified October 17 22:48 EDT 2018. Contains 316297 sequences. (Running on oeis4.)