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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

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

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Last modified July 26 08:44 EDT 2014. Contains 244925 sequences.