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A081568 as a simple table

n a(n)
0 1
1 4
2 17
3 75
4 338
5 1541
6 7069
7 32532
8 149965
9 691903
10 3193706
11 14745009
12 68084297
13 314394980
14 1451837593
15 6704518371
16 30961415074
17 142980203437
18 660285858245
19 3049218769908
20 14081386948661
21 65028302171639
22 300302858766202

[1,4,17,75,338,1541,7069,32532,149965,691903,
 3193706,14745009,68084297,314394980,1451837593,
 6704518371,30961415074,142980203437,660285858245,
 3049218769908,14081386948661,65028302171639,
 300302858766202]

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Last modified March 19 11:10 EDT 2019. Contains 321329 sequences. (Running on oeis4.)