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A002747 as a simple table

n a(n)
1 1
2 -2
3 9
4 -28
5 185
6 -846
7 7777
8 -47384
9 559953
10 -4264570
11 61594841
12 -562923252
13 9608795209
14 -102452031878
15 2017846993905
16 -24588487650736
17 548854382342177
18 -7524077221125234
19 187708198761024553
20 -2859149344027588940
21 78837443479630312281
22 -1320926996940746090302

[1,-2,9,-28,185,-846,7777,-47384,559953,-4264570,
 61594841,-562923252,9608795209,-102452031878,
 2017846993905,-24588487650736,548854382342177,
 -7524077221125234,187708198761024553,
 -2859149344027588940,78837443479630312281,
 -1320926996940746090302]

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Last modified September 15 14:04 EDT 2019. Contains 327078 sequences. (Running on oeis4.)