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A001688 as a simple table

n a(n)
0 9
1 53
2 362
3 2790
4 24024
5 229080
6 2399760
7 27422640
8 339696000
9 4536362880
10 64988179200
11 994447238400
12 16190733081600
13 279499828608000
14 5100017213491200
15 98087346669312000
16 1983334021853184000
17 42063950934061056000
18 933754193111900160000

[9,53,362,2790,24024,229080,2399760,27422640,
 339696000,4536362880,64988179200,994447238400,
 16190733081600,279499828608000,5100017213491200,
 98087346669312000,1983334021853184000,
 42063950934061056000,933754193111900160000]

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Last modified March 29 11:14 EDT 2024. Contains 371278 sequences. (Running on oeis4.)