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A126966 as a simple table

n a(n)
0 1
1 0
2 -2
3 -8
4 -26
5 -80
6 -244
7 -752
8 -2362
9 -7584
10 -24892
11 -83376
12 -284324
13 -984672
14 -3455144
15 -12259168
16 -43908026
17 -158531392
18 -576352364
19 -2107982128
20 -7750490636
21 -28629222112
22 -106190978264
23 -395347083808
24 -1476813394916
25 -5533435084480
26 -20790762971864
27 -78316232088032

[1,0,-2,-8,-26,-80,-244,-752,-2362,-7584,-24892,
 -83376,-284324,-984672,-3455144,-12259168,
 -43908026,-158531392,-576352364,-2107982128,
 -7750490636,-28629222112,-106190978264,
 -395347083808,-1476813394916,-5533435084480,
 -20790762971864,-78316232088032]

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Last modified April 23 19:56 EDT 2024. Contains 371916 sequences. (Running on oeis4.)