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A263965 as a simple table

n a(n)
1 4
2 20
3 108
4 465
5 2265
6 10920
7 52752
8 253176
9 1221305
10 5885873
11 28368956
12 136712788
13 658952404
14 3175970497
15 15307435585
16 73778034832
17 355593913600
18 1713880597360
19 8260513454657
20 39813787812289
21 191893397639092
22 924882430123988

[4,20,108,465,2265,10920,52752,253176,1221305,
 5885873,28368956,136712788,658952404,3175970497,
 15307435585,73778034832,355593913600,
 1713880597360,8260513454657,39813787812289,
 191893397639092,924882430123988]

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Last modified June 24 21:51 EDT 2022. Contains 354830 sequences. (Running on oeis4.)