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A012040 as a simple table

n a(n)
0 1
1 -3
2 49
3 -2075
4 168865
5 -22606675
6 4522468625
7 -1266169501675
8 473063766306625
9 -227507081427747875
10 136918092950286480625
11 -100805803028947763426875
12 89129323309512937147750625

[1,-3,49,-2075,168865,-22606675,4522468625,
 -1266169501675,473063766306625,
 -227507081427747875,136918092950286480625,
 -100805803028947763426875,
 89129323309512937147750625]

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Last modified January 28 23:12 EST 2022. Contains 350670 sequences. (Running on oeis4.)