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A290265 as a simple table

n a(n)
0 0
1 0
2 0
3 2
4 4
5 16
6 38
7 114
8 288
9 800
10 2092
11 5702
12 15244
13 41568
14 112884
15 309822
16 851344
17 2354656
18 6530336
19 18193238
20 50834716
21 142530256
22 400713502
23 1129710694
24 3192584432
25 9043259136
26 25669403892
27 73007358218
28 208022076292
29 593741582912
30 1697381979094
31 4859758184274
32 13933559180928

[0,0,0,2,4,16,38,114,288,800,2092,5702,15244,
 41568,112884,309822,851344,2354656,6530336,
 18193238,50834716,142530256,400713502,1129710694,
 3192584432,9043259136,25669403892,73007358218,
 208022076292,593741582912,1697381979094,
 4859758184274,13933559180928]

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Last modified July 27 08:33 EDT 2021. Contains 346304 sequences. (Running on oeis4.)