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A167639 as a simple table

n a(n)
0 0
1 0
2 1
3 0
4 3
5 2
6 12
7 16
8 59
9 110
10 325
11 716
12 1926
13 4584
14 11887
15 29328
16 75071
17 188462
18 480778
19 1217876
20 3107689
21 7913082
22 20221903
23 51664040
24 132259190
25 338721180
26 868587021
27 2228677360
28 5723740309
29 14709001454
30 37826827606
31 97335031824

[0,0,1,0,3,2,12,16,59,110,325,716,1926,4584,11887,
 29328,75071,188462,480778,1217876,3107689,7913082,
 20221903,51664040,132259190,338721180,868587021,
 2228677360,5723740309,14709001454,37826827606,
 97335031824]

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Last modified May 22 17:09 EDT 2013. Contains 225556 sequences.