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A000287 formatted as a simple table:

n a(n)
6 1
7 0
8 4
9 6
10 24
11 66
12 214
13 676
14 2209
15 7296
16 24460
17 82926
18 284068
19 981882
20 3421318
21 12007554
22 42416488
23 150718770
24 538421590
25 1932856590
26 6969847486 

[1,0,4,6,24,66,214,676,2209,7296,24460,82926,
 284068,981882,3421318,12007554,42416488,150718770,
 538421590,1932856590,6969847486]

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Last modified December 5 20:25 EST 2009. Contains 170428 sequences.

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