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A012697 as a simple table

n a(n)
0 1
1 0
2 2
3 -3
4 28
5 -110
6 1058
7 -6804
8 75024
9 -664488
10 8456712
11 -94737720
12 1378535112
13 -18587872368
14 305610292752
15 -4802794952760
16 88232994448128
17 -1580181612876864
18 32119507894881216
19 -644756418530970624

[1,0,2,-3,28,-110,1058,-6804,75024,-664488,
 8456712,-94737720,1378535112,-18587872368,
 305610292752,-4802794952760,88232994448128,
 -1580181612876864,32119507894881216,
 -644756418530970624]

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Last modified December 7 23:11 EST 2016. Contains 278900 sequences.