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A109642 as a simple table

n a(n)
1 4
2 15
3 57
4 765
5 1025
6 2097
7 4947
8 9189
9 103599
10 216927
11 4346128
12 1558269
13 1977777

[4,15,57,765,1025,2097,4947,9189,103599,216927,
 4346128,1558269,1977777]

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)