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A006491 formatted as a simple table:

n a(n)
1 1
2 0
3 4
4 5
5 15
6 28
7 60
8 117
9 230
10 440
11 834
12 1560
13 2891
14 5310
15 9680
16 17527
17 31545
18 56468
19 100590
20 178395
21 315106
22 554530
23 972564
24 1700400
25 2964325
26 5153868
27 8938300
28 15465497
29 26700915
30 46004620
31 79112304
32 135801105
33 232715006
34 398151740

[1,0,4,5,15,28,60,117,230,440,834,1560,2891,5310,
 9680,17527,31545,56468,100590,178395,315106,
 554530,972564,1700400,2964325,5153868,8938300,
 15465497,26700915,46004620,79112304,135801105,
 232715006,398151740]

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.


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