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A074552 formatted as a simple table:

n a(n)
0 3
1 15
2 83
3 495
4 3107
5 20175
6 134003
7 903855
8 6161987
9 42326415
10 292299923
11 2026332015
12 14085959267
13 98111307855
14 684331371443
15 4778093436975
16 33385561506947
17 233393582580495
18 1632228682596563
19 11417969833962735

[3,15,83,495,3107,20175,134003,903855,6161987,
 42326415,292299923,2026332015,14085959267,
 98111307855,684331371443,4778093436975,
 33385561506947,233393582580495,1632228682596563,
 11417969833962735]

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.


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