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A006027 formatted as a simple table:

n a(n)
1 1
2 1
3 2
4 6
5 20
6 71
7 263
8 1005
9 3933
10 15684
11 63505
12 260390
13 1079019
14 4511700
15 19011521
16 80653480
17 344193353
18 1476589475
19 6364258163
20 27545933212
21 119676949397
22 521739175908
23 2281673067934
24 10006784399183

[1,1,2,6,20,71,263,1005,3933,15684,63505,260390,
 1079019,4511700,19011521,80653480,344193353,
 1476589475,6364258163,27545933212,119676949397,
 521739175908,2281673067934,10006784399183]

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.


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