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A057693 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 18
5 66
6 276
7 1212
8 5916
9 31068
10 171576
11 1014696
12 6319512
13 41143896
14 281590128
15 2007755856
16 14871825936
17 114577550352
18 913508184096
19 7526682826848
20 64068860545056
21 561735627038496
22 5068388485760832
23 47026385852423616
24 447837548306401728

[1,1,2,6,18,66,276,1212,5916,31068,171576,1014696,
 6319512,41143896,281590128,2007755856,14871825936,
 114577550352,913508184096,7526682826848,
 64068860545056,561735627038496,5068388485760832,
 47026385852423616,447837548306401728]

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Last modified April 22 21:39 EDT 2018. Contains 302916 sequences. (Running on oeis4.)