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A054360 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 4
8 26
9 235
10 1585
11 10453
12 40151
13 199922
14 792867
15 3146993
16 12532362
17 49280874
18 189564720
19 739243108
20 2858545267
21 11101139486
22 43154849550
23 167993679964
24 654778791594
25 2556955750961

[0,0,0,0,0,0,4,26,235,1585,10453,40151,199922,
 792867,3146993,12532362,49280874,189564720,
 739243108,2858545267,11101139486,43154849550,
 167993679964,654778791594,2556955750961]

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Last modified July 29 06:36 EDT 2014. Contains 245019 sequences.