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A099121 as a simple table

n a(n)
0 1
1 3
2 21
3 220
4 3060
5 53130
6 1107568
7 26978328
8 752538150
9 23667689815
10 828931106355
11 32006008361808
12 1350990969850340
13 61902409203193230
14 3060335715568296000
15 162392216278033616560
16 9206887338937200407418 

[1,3,21,220,3060,53130,1107568,26978328,752538150,
 23667689815,828931106355,32006008361808,
 1350990969850340,61902409203193230,
 3060335715568296000,162392216278033616560,
 9206887338937200407418]

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Last modified June 8 17:52 EDT 2024. Contains 373227 sequences. (Running on oeis4.)