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A268587 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 5
5 24
6 85
7 264
8 760
9 2080
10 5488
11 14080
12 35328
13 87040
14 211200
15 505856
16 1198080
17 2809856
18 6533120
19 15073280
20 34537472
21 78643200
22 178061312
23 401080320
24 899153920
25 2006974464
26 4461690880
27 9881780224
28 21810380800
29 47982837760
30 105243475968

[0,0,0,0,5,24,85,264,760,2080,5488,14080,35328,
 87040,211200,505856,1198080,2809856,6533120,
 15073280,34537472,78643200,178061312,401080320,
 899153920,2006974464,4461690880,9881780224,
 21810380800,47982837760,105243475968]

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Last modified March 29 10:22 EDT 2024. Contains 371268 sequences. (Running on oeis4.)