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A027853 formatted as a simple table:

n a(n)
0 0
1 1
2 4
3 15
4 52
5 175
6 571
7 1838
8 5834
9 18363
10 57372
11 178271
12 551344
13 1698782
14 5217266
15 15979465
16 48825416
17 148877730
18 453124341
19 1376890744
20 4177819301
21 12659943750
22 38317731349
23 115851225052
24 349924919167

[0,1,4,15,52,175,571,1838,5834,18363,57372,178271,
 551344,1698782,5217266,15979465,48825416,
 148877730,453124341,1376890744,4177819301,
 12659943750,38317731349,115851225052,
 349924919167]

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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