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A121050 formatted as a simple table:

n a(n)
1 0
2 0
3 0
4 1
5 2
6 3
7 8
8 22
9 66
10 231
11 898
12 3841
13 17916
14 90407
15 490428
16 2844978
17 17570216
18 115078238
19 796630973
20 5811215760
21 44551231394
22 358087648043
23 3010990488155
24 26433752431414
25 241852566790861
26 2302304545944429
27 22768248457537812

[0,0,0,1,2,3,8,22,66,231,898,3841,17916,90407,
 490428,2844978,17570216,115078238,796630973,
 5811215760,44551231394,358087648043,3010990488155,
 26433752431414,241852566790861,2302304545944429,
 22768248457537812]

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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