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A156447 as a simple table

n a(n)
2 1
3 0
4 2
5 2
6 24
7 60
8 1483
9 10236
10 175765
11 2771020
12 133072650
13 2511725250
14 142353126510
15 4354347220860
16 366766557522330
17 16657062087640520 

[1,0,2,2,24,60,1483,10236,175765,2771020,
 133072650,2511725250,142353126510,4354347220860,
 366766557522330,16657062087640520]

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Last modified September 29 14:55 EDT 2023. Contains 365772 sequences. (Running on oeis4.)