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A115968 as a simple table

n a(n)
0 1
1 3
2 13
3 57
4 255
5 1149
6 5201
7 23607
8 107345
9 488721
10 2227007
11 10154511
12 46323507
13 211396611
14 964966149
15 4405717137
16 20118308687
17 91880092029
18 419657355725
19 1916914550859
20 8756654087981
21 40003289475363
22 182755724339143

[1,3,13,57,255,1149,5201,23607,107345,488721,
 2227007,10154511,46323507,211396611,964966149,
 4405717137,20118308687,91880092029,419657355725,
 1916914550859,8756654087981,40003289475363,
 182755724339143]

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Last modified June 2 18:17 EDT 2020. Contains 334787 sequences. (Running on oeis4.)