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A006836 as a simple table

n a(n)
0 1
1 0
2 0
3 -1
4 -2
5 -5
6 -10
7 -20
8 -41
9 -86
10 -182
11 -393
12 -853
13 -1887
14 -4208
15 -9445
16 -21350
17 -48612
18 -111307
19 -255236
20 -590543
21 -1362919
22 -3182137
23 -7362611
24 -17377129
25 -40125851
26 -96106251
27 -219681825
28 -539266908
29 -1200140540

[1,0,0,-1,-2,-5,-10,-20,-41,-86,-182,-393,-853,
 -1887,-4208,-9445,-21350,-48612,-111307,-255236,
 -590543,-1362919,-3182137,-7362611,-17377129,
 -40125851,-96106251,-219681825,-539266908,
 -1200140540]

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Last modified December 10 19:08 EST 2016. Contains 279005 sequences.