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A003297 formatted as a simple table:

n a(n)
2 1
3 9
4 49
5 214
6 800
7 2685
8 8274
9 23829
10 64843
11 168223
12 418723
13 1005269
14 2337340
15 5281304
16 11629334
17 25015300
18 52670865
19 108745666
20 220489361
21 439619133
22 862952442
23 1669440245
24 3185892198
25 6002458625
26 11173532683
27 20564107275

[1,9,49,214,800,2685,8274,23829,64843,168223,
 418723,1005269,2337340,5281304,11629334,25015300,
 52670865,108745666,220489361,439619133,862952442,
 1669440245,3185892198,6002458625,11173532683,
 20564107275]

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.


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