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A320935 as a simple table

n a(n)
1 0
2 0
3 1
4 4
5 20
6 86
7 400
8 1852
9 8868
10 42892
11 210346
12 1038034
13 5150110
14 25623486
15 127740880
16 637539592
17 3184224728
18 15910524632
19 79520923966
20 397508610454
21 1987255480650
22 9935410066186
23 49674450471460
24 248364429410332
25 1241798688445588
26 6208922948527572
27 31044403310614786

[0,0,1,4,20,86,400,1852,8868,42892,210346,1038034,
 5150110,25623486,127740880,637539592,3184224728,
 15910524632,79520923966,397508610454,
 1987255480650,9935410066186,49674450471460,
 248364429410332,1241798688445588,6208922948527572,
 31044403310614786]

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Last modified April 19 15:03 EDT 2024. Contains 371794 sequences. (Running on oeis4.)