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A181047 as a simple table

n a(n)
0 1
1 3
2 9
3 27
4 54
5 180
6 426
7 1080
8 2724
9 6300
10 16512
11 42432
12 98064
13 248256
14 616656
15 1509888
16 3767040 

[1,3,9,27,54,180,426,1080,2724,6300,16512,42432,
 98064,248256,616656,1509888,3767040]

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Last modified April 15 23:55 EDT 2024. Contains 371696 sequences. (Running on oeis4.)