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A270947 as a simple table

n a(n)
0 1
1 8
2 40
3 189
4 812
5 3540
6 14224
7 58672
8 235520
9 943648
10 3785836
11 15139112
12 60577080
13 242359424
14 969552509
15 3878246660 

[1,8,40,189,812,3540,14224,58672,235520,943648,
 3785836,15139112,60577080,242359424,969552509,
 3878246660]

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Last modified July 30 22:55 EDT 2024. Contains 374771 sequences. (Running on oeis4.)