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A138350 formatted as a simple table:

n a(n)
0 1
1 -1
2 3
3 -6
4 20
5 -50
6 175
7 -490
8 1764
9 -5292
10 19404
11 -60984
12 226512
13 -736164
14 2760615
15 -9202050
16 34763300
17 -118195220
18 449141836
19 -1551580888
20 5924217936
21 -20734762776
22 79483257308
23 -281248448936
24 1081724803600
25 -3863302870000
26 14901311070000
27 -53644719852000

[1,-1,3,-6,20,-50,175,-490,1764,-5292,19404,
 -60984,226512,-736164,2760615,-9202050,34763300,
 -118195220,449141836,-1551580888,5924217936,
 -20734762776,79483257308,-281248448936,
 1081724803600,-3863302870000,14901311070000,
 -53644719852000]

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Last modified December 5 20:25 EST 2009. Contains 170428 sequences.


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