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A037231 formatted as a simple table:

n a(n)
1 2
2 3
3 7
4 23
5 43
6 139
7 283
8 659
9 1319
10 5179
11 9227
12 23159
13 55399
14 148439
15 366683
16 793439
17 1953839
18 4875119
19 9750239
20 27353747
21 71815607
22 192287243 

[2,3,7,23,43,139,283,659,1319,5179,9227,23159,
 55399,148439,366683,793439,1953839,4875119,
 9750239,27353747,71815607,192287243]

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.

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