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A001261 formatted as a simple table:

n a(n)
6 1
7 6
8 63
9 616
10 6678
11 77868
12 978978
13 13216104
14 190899423
15 2939850914
16 48106651593
17 833848627248
18 15265844099324
19 294412707629208
20 5966764207952724
21 126793739418994416
22 2819296088257641741
23 65470320271760790078

[1,6,63,616,6678,77868,978978,13216104,190899423,
 2939850914,48106651593,833848627248,
 15265844099324,294412707629208,5966764207952724,
 126793739418994416,2819296088257641741,
 65470320271760790078]

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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.


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