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A055732 as a simple table

n a(n)
0 0
1 4
2 15
3 68
4 357
5 1939
6 11098
7 65685
8 397764
9 2453911
10 15353323
11 97163605
12 620646217
13 3995149838
14 25885182840
15 168650876819
16 1104127111380
17 7259025764932
18 47901523494261
19 317140339436292
20 2105877503513609
21 14020561559878216
22 93570332318306847
23 625829902867176558
24 4194084944321575624
25 28158446635057280702
26 189368274899202732322

[0,4,15,68,357,1939,11098,65685,397764,2453911,
 15353323,97163605,620646217,3995149838,
 25885182840,168650876819,1104127111380,
 7259025764932,47901523494261,317140339436292,
 2105877503513609,14020561559878216,
 93570332318306847,625829902867176558,
 4194084944321575624,28158446635057280702,
 189368274899202732322]

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Last modified October 21 06:29 EDT 2014. Contains 248375 sequences.