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A180239 as a simple table

n a(n)
0 1
1 4
2 16
3 64
4 244
5 856
6 2776
7 8356
8 23032
9 59200
10 142624
11 324484
12 696256
13 1422436
14 2779900
15 5219452
16 9455596 

[1,4,16,64,244,856,2776,8356,23032,59200,142624,
 324484,696256,1422436,2779900,5219452,9455596]

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Last modified April 17 23:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)