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A147621 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 4
5 26
6 120
7 455
8 1456
9 4122
10 10608
11 25194
12 55980
13 117572
14 235144
15 450681
16 832048
17 1485800
18 2575368
19 4345965
20 7158060
21 11532402
22 18209100
23 28224105
24 43008120
25 64512240
26 95365920
27 139075245
28 200268432
29 284997384
30 401107356

[0,0,0,0,4,26,120,455,1456,4122,10608,25194,55980,
 117572,235144,450681,832048,1485800,2575368,
 4345965,7158060,11532402,18209100,28224105,
 43008120,64512240,95365920,139075245,200268432,
 284997384,401107356]

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Last modified May 23 19:07 EDT 2019. Contains 323528 sequences. (Running on oeis4.)