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A001090 as a simple table

n a(n)
0 0
1 1
2 8
3 63
4 496
5 3905
6 30744
7 242047
8 1905632
9 15003009
10 118118440
11 929944511
12 7321437648
13 57641556673
14 453811015736
15 3572846569215
16 28128961537984
17 221458845734657
18 1743541804339272
19 13726875588979519
20 108071462907496880

[0,1,8,63,496,3905,30744,242047,1905632,15003009,
 118118440,929944511,7321437648,57641556673,
 453811015736,3572846569215,28128961537984,
 221458845734657,1743541804339272,
 13726875588979519,108071462907496880]

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Last modified November 23 17:23 EST 2014. Contains 249851 sequences.