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A141221 formatted as a simple table:

n a(n)
1 0
2 30
3 156
4 826
5 4406
6 23562
7 126104
8 675074
9 3614142
10 19349430
11 103593804
12 554625898
13 2969386478
14 15897666066
15 85113810056
16 455687062274
17 2439682811478
18 13061709929934
19 69930511268508
20 374397872321626

[0,30,156,826,4406,23562,126104,675074,3614142,
 19349430,103593804,554625898,2969386478,
 15897666066,85113810056,455687062274,
 2439682811478,13061709929934,69930511268508,
 374397872321626]

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.


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