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A255386 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 2
5 4
6 10
7 20
8 42
9 84
10 166
11 320
12 608
13 1140
14 2116
15 3892
16 7102
17 12868
18 23170
19 41488
20 73918
21 131104
22 231578
23 407520
24 714672
25 1249368
26 2177736
27 3785688
28 6564362
29 11355940
30 19602154
31 33767228
32 58056786
33 99638364
34 170711134
35 292011872
36 498747632

[0,0,0,0,2,4,10,20,42,84,166,320,608,1140,2116,
 3892,7102,12868,23170,41488,73918,131104,231578,
 407520,714672,1249368,2177736,3785688,6564362,
 11355940,19602154,33767228,58056786,99638364,
 170711134,292011872,498747632]

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Last modified August 8 11:31 EDT 2020. Contains 336298 sequences. (Running on oeis4.)