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A121956 formatted as a simple table:

n a(n)
1 0
2 1
3 1
4 2
5 5
6 12
7 34
8 99
9 315
10 1042
11 3661
12 13354
13 51006
14 201561
15 826987
16 3498286
17 15277665
18 68578942
19 316519868
20 1497639547
21 7263576113
22 36035247374
23 182804409181
24 946808180148
25 5004540429504
26 26963932982089
27 148019711470333

[0,1,1,2,5,12,34,99,315,1042,3661,13354,51006,
 201561,826987,3498286,15277665,68578942,316519868,
 1497639547,7263576113,36035247374,182804409181,
 946808180148,5004540429504,26963932982089,
 148019711470333]

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.


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