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A228950 as a simple table

n a(n)
0 1
1 4
2 16
3 68
4 312
5 1560
6 8528
7 50864
8 329248
9 2298592
10 17203264
11 137289920 

[1,4,16,68,312,1560,8528,50864,329248,2298592,
 17203264,137289920]

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