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A012251 as a simple table

n a(n)
0 1
1 1
2 1
3 -2
4 -11
5 24
6 349
7 -720
8 -22455
9 40320
10 2465241
11 -3628800
12 -416217603
13 479001600
14 100729124469
15 -87178291200
16 -33198564667887
17 20922789888000
18 14328891118054449
19 -6402373705728000
20 -7852649782447649403

[1,1,1,-2,-11,24,349,-720,-22455,40320,2465241,
 -3628800,-416217603,479001600,100729124469,
 -87178291200,-33198564667887,20922789888000,
 14328891118054449,-6402373705728000,
 -7852649782447649403]

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Last modified February 26 20:11 EST 2024. Contains 370352 sequences. (Running on oeis4.)