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A013261 formatted as a simple table:

n a(n)
0 -1
1 1
2 -6
3 23
4 -90
5 509
6 -1960
7 7251
8 20160
9 -1028821
10 16750008
11 -249844519
12 3354647296
13 -42644099135
14 506129014560
15 -4945670890617
16 23557830350976
17 694520543221487
18 -32533456838195320
19 956551460942273757

[-1,1,-6,23,-90,509,-1960,7251,20160,-1028821,
 16750008,-249844519,3354647296,-42644099135,
 506129014560,-4945670890617,23557830350976,
 694520543221487,-32533456838195320,
 956551460942273757]

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.


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