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A087433 formatted as a simple table:

n a(n)
0 1
1 2
2 6
3 20
4 70
5 252
6 926
7 3460
8 13110
9 50252
10 194446
11 758100
12 2973350
13 11716252
14 46333566
15 183739940
16 730176790
17 2906358252
18 11582386286
19 46200404980
20 184414199430
21 736494536252
22 2942491360606
23 11759505089220
24 47006639297270

[1,2,6,20,70,252,926,3460,13110,50252,194446,
 758100,2973350,11716252,46333566,183739940,
 730176790,2906358252,11582386286,46200404980,
 184414199430,736494536252,2942491360606,
 11759505089220,47006639297270]

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


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