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A038144 formatted as a simple table:

n a(n)
1 0
2 0
3 0
4 0
5 0
6 1
7 2
8 13
9 67
10 404
11 2323
12 13517
13 76570
14 429320
15 2373965
16 13004323
17 70641985
18 381260615
19 2046521491
20 10936624026
21 58228136539

[0,0,0,0,0,1,2,13,67,404,2323,13517,76570,429320,
 2373965,13004323,70641985,381260615,2046521491,
 10936624026,58228136539]

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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