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A227886 as a simple table

n a(n)
1 1
2 1
3 -2
4 6
5 -24
6 -820
7 27144
8 -1291488
9 59107938
10 -3469468244
11 -551251146312
12 110380085358300
13 -14603070221993568
14 1245952635117666628
15 29007906387788967008
16 -20843885535528328473491
17 -180339645015007436197752
18 127321605693530805940344950
19 281613877399819446654643101264

[1,1,-2,6,-24,-820,27144,-1291488,59107938,
 -3469468244,-551251146312,110380085358300,
 -14603070221993568,1245952635117666628,
 29007906387788967008,-20843885535528328473491,
 -180339645015007436197752,
 127321605693530805940344950,
 281613877399819446654643101264]

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Last modified November 21 04:41 EST 2019. Contains 329350 sequences. (Running on oeis4.)