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A143648 as a simple table

n a(n)
0 1
1 4
2 22
3 136
4 868
5 5584
6 35992
7 232096
8 1496848
9 9653824
10 62262112
11 401558656
12 2589848128
13 16703198464
14 107727106432
15 694784866816
16 4481007870208
17 28900214293504
18 186391635645952
19 1202130942232576
20 7753131181401088

[1,4,22,136,868,5584,35992,232096,1496848,9653824,
 62262112,401558656,2589848128,16703198464,
 107727106432,694784866816,4481007870208,
 28900214293504,186391635645952,1202130942232576,
 7753131181401088]

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Last modified October 18 12:18 EDT 2019. Contains 328160 sequences. (Running on oeis4.)