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A077985 as a simple table

n a(n)
0 1
1 -2
2 5
3 -12
4 29
5 -70
6 169
7 -408
8 985
9 -2378
10 5741
11 -13860
12 33461
13 -80782
14 195025
15 -470832
16 1136689
17 -2744210
18 6625109
19 -15994428
20 38613965
21 -93222358
22 225058681
23 -543339720
24 1311738121
25 -3166815962
26 7645370045
27 -18457556052
28 44560482149
29 -107578520350
30 259717522849

[1,-2,5,-12,29,-70,169,-408,985,-2378,5741,-13860,
 33461,-80782,195025,-470832,1136689,-2744210,
 6625109,-15994428,38613965,-93222358,225058681,
 -543339720,1311738121,-3166815962,7645370045,
 -18457556052,44560482149,-107578520350,
 259717522849]

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Last modified November 12 07:03 EST 2019. Contains 329052 sequences. (Running on oeis4.)