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Number of strictly increasing arrangements of n numbers in -(n+5)..(n+5) with sum zero
1

%I #5 Mar 31 2012 12:36:11

%S 1,7,32,150,649,2739,11322,46029,184717,734517,2900900,11396054,

%T 44585180,173885716,676537634,2627337510,10188889502,39470938574,

%U 152787805216,591094837268,2285918145819,8838165075791,34167434076214,132084761317107

%N Number of strictly increasing arrangements of n numbers in -(n+5)..(n+5) with sum zero

%C Column 7 of A188181

%H R. H. Hardin, <a href="/A188179/b188179.txt">Table of n, a(n) for n = 1..26</a>

%e Some solutions for n=5

%e .-4...-9...-9...-8...-7...-7..-10...-7..-10..-10...-9...-9..-10...-9...-6...-7

%e .-3...-7...-5...-5...-3...-3...-5...-3....0...-8...-4...-3...-7...-4...-2...-2

%e .-1....0...-2...-3....2...-1....2....1....1....2....1....0....3...-2....0....0

%e ..0....7....7....7....3....3....4....3....4....6....5....2....4....5....3....2

%e ..8....9....9....9....5....8....9....6....5...10....7...10...10...10....5....7

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 23 2011

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