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A012131 as a simple table

n a(n)
0 1
1 1
2 -3
3 21
4 -263
5 4841
6 -99723
7 -199939
8 501445617
9 -101818966319
10 19731909099757
11 -4192563651606299
12 1009030667701246697
13 -277080625752723191879
14 86724157841631252590437
15 -30813037783471577493355059
16 12363651257099764677344554977

[1,1,-3,21,-263,4841,-99723,-199939,501445617,
 -101818966319,19731909099757,-4192563651606299,
 1009030667701246697,-277080625752723191879,
 86724157841631252590437,
 -30813037783471577493355059,
 12363651257099764677344554977]

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Last modified November 15 04:00 EST 2018. Contains 317225 sequences. (Running on oeis4.)