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A225439 as a simple table

n a(n)
0 1
1 3
2 21
3 162
4 1305
5 10773
6 90342
7 765936
8 6546177
9 56293380
10 486451251
11 4220183916
12 36731240910
13 320571837810
14 2804298945840
15 24580601689752
16 215832643307217
17 1898042178972285
18 16714070686567620
19 147360883148636850
20 1300623629653125855

[1,3,21,162,1305,10773,90342,765936,6546177,
 56293380,486451251,4220183916,36731240910,
 320571837810,2804298945840,24580601689752,
 215832643307217,1898042178972285,
 16714070686567620,147360883148636850,
 1300623629653125855]

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Last modified May 28 21:37 EDT 2020. Contains 334690 sequences. (Running on oeis4.)