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A135489 formatted as a simple table:

n a(n)
0 1
1 4
2 12
3 42
4 148
5 540
6 1990
7 7434
8 27972
9 106008
10 403764
11 1544796
12 5931486
13 22846252
14 88228998
15 341518606
16 1324627044
17 5146959168
18 20030812360
19 78066774400
20 304643526276
21 1190209498344
22 4654949367204
23 18223301727108

[1,4,12,42,148,540,1990,7434,27972,106008,403764,
 1544796,5931486,22846252,88228998,341518606,
 1324627044,5146959168,20030812360,78066774400,
 304643526276,1190209498344,4654949367204,
 18223301727108]

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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