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A188115 as a simple table

n a(n)
1 0
2 2
3 2
4 8
5 16
6 52
7 152
8 484
9 1536
10 5064
11 16946
12 57528
13 197616
14 686588
15 2407538
16 8510428
17 30300268
18 108575996
19 391301260
20 1417520988
21 5159160792
22 18857230104
23 69193592020
24 254802169904
25 941383915572
26 3488574124056
27 12964318919492

[0,2,2,8,16,52,152,484,1536,5064,16946,57528,
 197616,686588,2407538,8510428,30300268,108575996,
 391301260,1417520988,5159160792,18857230104,
 69193592020,254802169904,941383915572,
 3488574124056,12964318919492]

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Last modified February 8 11:17 EST 2023. Contains 360138 sequences. (Running on oeis4.)