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A227293 as a simple table

n a(n)
0 1
1 2
2 -2
3 4
4 -2
5 12
6 -36
7 104
8 -330
9 1068
10 -3356
11 10808
12 -35156
13 115192
14 -380744
15 1267152
16 -4242778
17 14285644
18 -48336684
19 164272984
20 -560515836
21 1919455464
22 -6594719992
23 22725877680
24 -78531331524
25 272062125048
26 -944738639640
27 3287748182064
28 -11464667424744
29 40053463412080
30 -140178051713680
31 491396601445280

[1,2,-2,4,-2,12,-36,104,-330,1068,-3356,10808,
 -35156,115192,-380744,1267152,-4242778,14285644,
 -48336684,164272984,-560515836,1919455464,
 -6594719992,22725877680,-78531331524,272062125048,
 -944738639640,3287748182064,-11464667424744,
 40053463412080,-140178051713680,491396601445280]

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Last modified May 9 13:42 EDT 2021. Contains 343742 sequences. (Running on oeis4.)