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A230813 as a simple table

n a(n)
1 0
2 0
3 2
4 0
5 2
6 12
7 18
8 56
9 170
10 420
11 1162
12 3200
13 8562
14 23292
15 63298
16 171336
17 464890
18 1261140
19 3419322
20 9274000
21 25152322
22 68211372
23 184993778
24 501712216
25 1360654410
26 3690150660
27 10007829482
28 27141578400
29 73608971282
30 199630236252

[0,0,2,0,2,12,18,56,170,420,1162,3200,8562,23292,
 63298,171336,464890,1261140,3419322,9274000,
 25152322,68211372,184993778,501712216,1360654410,
 3690150660,10007829482,27141578400,73608971282,
 199630236252]

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Last modified May 29 07:13 EDT 2022. Contains 354122 sequences. (Running on oeis4.)