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A027286 formatted as a simple table:

n a(n)
0 1
1 4
2 18
3 56
4 190
5 564
6 1722
7 4976
8 14454
9 40940
10 115698
11 322728
12 896558
13 2471588
14 6786090
15 18537184
16 50459366
17 136844892
18 370030434
19 997705240
20 2683514526
21 7201203988
22 19284880794
23 51546789456
24 137541880150
25 366412976332

[1,4,18,56,190,564,1722,4976,14454,40940,115698,
 322728,896558,2471588,6786090,18537184,50459366,
 136844892,370030434,997705240,2683514526,
 7201203988,19284880794,51546789456,137541880150,
 366412976332]

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.


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