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A188496 as a simple table

n a(n)
0 0
1 0
2 2
3 4
4 10
5 28
6 96
7 304
8 928
9 2784
10 8504
11 26124
12 80228
13 245544
14 751168
15 2299184
16 7040986
17 21561028
18 66015398
19 202114264
20 618817376
21 1894692160
22 5801169248
23 17761879056
24 54382725520
25 166507388264
26 509808051944
27 1560917463152
28 4779176035680

[0,0,2,4,10,28,96,304,928,2784,8504,26124,80228,
 245544,751168,2299184,7040986,21561028,66015398,
 202114264,618817376,1894692160,5801169248,
 17761879056,54382725520,166507388264,509808051944,
 1560917463152,4779176035680]

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Last modified November 22 18:55 EST 2019. Contains 329410 sequences. (Running on oeis4.)