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A046090 formatted as a simple table:

n a(n)
0 1
1 4
2 21
3 120
4 697
5 4060
6 23661
7 137904
8 803761
9 4684660
10 27304197
11 159140520
12 927538921
13 5406093004
14 31509019101
15 183648021600
16 1070379110497
17 6238626641380
18 36361380737781
19 211929657785304
20 1235216565974041

[1,4,21,120,697,4060,23661,137904,803761,4684660,
 27304197,159140520,927538921,5406093004,
 31509019101,183648021600,1070379110497,
 6238626641380,36361380737781,211929657785304,
 1235216565974041]

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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