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A259987 as a simple table

n a(n)
1 4
2 28
3 136
4 1216
5 1216
6 16768
7 203392
8 1043200
9 6082048
10 36315136
11 36315136
12 1487503360
13 1487503360
14 1487503360
15 314944159744
16 785129144320
17 12069568774144
18 45922887663616
19 452162714337280
20 2280241934368768
21 2280241934368768
22 2280241934368768
23 2280241934368768

[4,28,136,1216,1216,16768,203392,1043200,6082048,
 36315136,36315136,1487503360,1487503360,
 1487503360,314944159744,785129144320,
 12069568774144,45922887663616,452162714337280,
 2280241934368768,2280241934368768,
 2280241934368768,2280241934368768]

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Last modified June 27 15:02 EDT 2024. Contains 373745 sequences. (Running on oeis4.)