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A144068 formatted as a simple table:

n a(n)
0 1
1 4
2 26
3 148
4 843
5 4632
6 25124
7 133784
8 703553
9 3655340
10 18800886
11 95819580
12 484416675
13 2431094352
14 12120072472
15 60058765072
16 295959923287
17 1450980481036
18 7079894939166
19 34393241899772
20 166390593502701
21 801877654792696
22 3850469199935412

[1,4,26,148,843,4632,25124,133784,703553,3655340,
 18800886,95819580,484416675,2431094352,
 12120072472,60058765072,295959923287,
 1450980481036,7079894939166,34393241899772,
 166390593502701,801877654792696,3850469199935412]

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Last modified December 6 19:58 EST 2009. Contains 170429 sequences.


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