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A268741 as a simple table

n a(n)
0 4
1 5
2 3
3 7
4 -1
5 15
6 -17
7 47
8 -81
9 175
10 -337
11 687
12 -1361
13 2735
14 -5457
15 10927
16 -21841
17 43695
18 -87377
19 174767
20 -349521
21 699055
22 -1398097
23 2796207
24 -5592401
25 11184815
26 -22369617
27 44739247
28 -89478481
29 178956975
30 -357913937
31 715827887
32 -1431655761
33 2863311535

[4,5,3,7,-1,15,-17,47,-81,175,-337,687,-1361,2735,
 -5457,10927,-21841,43695,-87377,174767,-349521,
 699055,-1398097,2796207,-5592401,11184815,
 -22369617,44739247,-89478481,178956975,-357913937,
 715827887,-1431655761,2863311535]

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Last modified February 20 01:06 EST 2018. Contains 299357 sequences. (Running on oeis4.)