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A009427 as a simple table

n a(n)
0 0
1 1
2 -1
3 5
4 -12
5 109
6 -405
7 4913
8 -24976
9 372633
10 -2419425
11 42646845
12 -338219244
13 6863821509
14 -64452230661
15 1478191260393
16 -16062969072000
17 410493211996977
18 -5072547848554017
19 142840036992492789
20 -1979718755185227180

[0,1,-1,5,-12,109,-405,4913,-24976,372633,
 -2419425,42646845,-338219244,6863821509,
 -64452230661,1478191260393,-16062969072000,
 410493211996977,-5072547848554017,
 142840036992492789,-1979718755185227180]

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Last modified August 5 22:41 EDT 2021. Contains 346488 sequences. (Running on oeis4.)