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A143555 as a simple table

n a(n)
0 1
1 1
2 4
3 8
4 28
5 80
6 308
7 984
8 3980
9 13472
10 56164
11 197032
12 838396
13 3013872
14 13015188
15 47624568
16 207971436
17 771336512
18 3397886660
19 12736715592
20 56502898140
21 213618833808
22 953139545076
23 3629043226392
24 16270547827020
25 62317467147744

[1,1,4,8,28,80,308,984,3980,13472,56164,197032,
 838396,3013872,13015188,47624568,207971436,
 771336512,3397886660,12736715592,56502898140,
 213618833808,953139545076,3629043226392,
 16270547827020,62317467147744]

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Last modified September 22 22:24 EDT 2020. Contains 337291 sequences. (Running on oeis4.)