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A250272 as a simple table

n a(n)
1 4
2 20
3 52
4 240
5 984
6 4412
7 20252
8 91808
9 406748
10 1759740
11 7455484
12 31056840
13 127719296
14 520368940
15 2106440916
16 8489650480
17 34118389900
18 136865613068
19 548408972596
20 2195889958776
21 8788865312160
22 35167823753468
23 140699850287804

[4,20,52,240,984,4412,20252,91808,406748,1759740,
 7455484,31056840,127719296,520368940,2106440916,
 8489650480,34118389900,136865613068,548408972596,
 2195889958776,8788865312160,35167823753468,
 140699850287804]

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Last modified September 16 00:43 EDT 2024. Contains 375959 sequences. (Running on oeis4.)