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A121254
as a simple table
n
a(n)
1
4
2
16
3
60
4
208
5
680
6
2136
7
6524
8
19520
9
57492
10
167240
11
481624
12
1375536
[4,16,60,208,680,2136,6524,19520,57492,167240, 481624,1375536]
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Last modified April 23 06:04 EDT 2024. Contains 371906 sequences. (Running on oeis4.)
