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A054877 as a simple table

n a(n)
0 1
1 0
2 2
3 0
4 6
5 2
6 20
7 14
8 70
9 72
10 254
11 330
12 948
13 1430
14 3614
15 6008
16 13990
17 24786
18 54740
19 101118
20 215766
21 409640
22 854702
23 1652090
24 3396916
25 6643782
26 13530350
27 26667864
28 53971350
29 106914242
30 215492564
31 428292590
32 860941798

[1,0,2,0,6,2,20,14,70,72,254,330,948,1430,3614,
 6008,13990,24786,54740,101118,215766,409640,
 854702,1652090,3396916,6643782,13530350,26667864,
 53971350,106914242,215492564,428292590,860941798]

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Last modified February 20 08:44 EST 2019. Contains 320325 sequences. (Running on oeis4.)