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A218899 as a simple table

n a(n)
1 8
2 16
3 72
4 212
5 786
6 2594
7 9110
8 31062
9 107510
10 369596
11 1274760
12 4390640
13 15132044
14 52139518
15 179669784
16 619118588
17 2133406676
18 7351495186
19 25332356634
20 87292564824
21 300799972600
22 1036523262982
23 3571740490936
24 12307815695422

[8,16,72,212,786,2594,9110,31062,107510,369596,
 1274760,4390640,15132044,52139518,179669784,
 619118588,2133406676,7351495186,25332356634,
 87292564824,300799972600,1036523262982,
 3571740490936,12307815695422]

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Last modified April 24 10:00 EDT 2024. Contains 371935 sequences. (Running on oeis4.)