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A010974 formatted as a simple table:

n a(n)
21 1
22 22
23 253
24 2024
25 12650
26 65780
27 296010
28 1184040
29 4292145
30 14307150
31 44352165
32 129024480
33 354817320
34 927983760
35 2319959400
36 5567902560
37 12875774670
38 28781143380
39 62359143990
40 131282408400
41 269128937220

[1,22,253,2024,12650,65780,296010,1184040,4292145,
 14307150,44352165,129024480,354817320,927983760,
 2319959400,5567902560,12875774670,28781143380,
 62359143990,131282408400,269128937220]

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


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