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A262591 as a simple table

n a(n)
3 0
4 0
5 4
6 16
7 60
8 208
9 726
10 2568
11 9196
12 33286
13 121572
14 447392
15 1657006
16 6170928
17 23091220
18 86767014
19 327235608
20 1238188768
21 4698767638

[0,0,4,16,60,208,726,2568,9196,33286,121572,
 447392,1657006,6170928,23091220,86767014,
 327235608,1238188768,4698767638]

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Last modified October 21 20:44 EDT 2019. Contains 328315 sequences. (Running on oeis4.)