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A153295 formatted as a simple table:

n a(n)
0 1
1 1
2 4
3 20
4 110
5 638
6 3828
7 23515
8 146972
9 930869
10 5958094
11 38462190
12 250054804
13 1635421543
14 10750864640
15 70987129653
16 470542935654
17 3129729034478
18 20880459397920
19 139689406647522
20 936832986074664
21 6297064070279195

[1,1,4,20,110,638,3828,23515,146972,930869,
 5958094,38462190,250054804,1635421543,10750864640,
 70987129653,470542935654,3129729034478,
 20880459397920,139689406647522,936832986074664,
 6297064070279195]

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.


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