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A000498 formatted as a simple table:

n a(n)
4 1
5 26
6 302
7 2416
8 15619
9 88234
10 455192
11 2203488
12 10187685
13 45533450
14 198410786
15 848090912
16 3572085255
17 14875399450
18 61403313100
19 251732291184
20 1026509354985
21 4168403181210
22 16871482830550
23 68111623139600

[1,26,302,2416,15619,88234,455192,2203488,
 10187685,45533450,198410786,848090912,3572085255,
 14875399450,61403313100,251732291184,
 1026509354985,4168403181210,16871482830550,
 68111623139600]

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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