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A019077 as a simple table

n a(n)
3 0
4 0
5 4
6 6
7 4
8 16
9 46
10 84
11 224
12 558
13 1380
14 3418
15 9272
16 23340
17 58462
18 153503
19 404026
20 1041448
21 2725482
22 7226277
23 19073734
24 50488500
25 134468292
26 358721980
27 958690662
28 2570501823
29 6906337888
30 18589047554

[0,0,4,6,4,16,46,84,224,558,1380,3418,9272,23340,
 58462,153503,404026,1041448,2725482,7226277,
 19073734,50488500,134468292,358721980,958690662,
 2570501823,6906337888,18589047554]

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Last modified July 19 08:23 EDT 2019. Contains 325155 sequences. (Running on oeis4.)