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A188228 Number of nondecreasing arrangements of n numbers in -(n-1)..(n-1) with sum zero and not more than two numbers equal 1

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

%S 1,2,4,15,58,245,1082,5020,24040,118154,592332,3019280,15604848,

%T 81614541,431227650,2298833499,12350952158,66818754504,363727676848,

%U 1990946917066,10952512200610,60525264890259,335856363303010,1870732844007387

%N Number of nondecreasing arrangements of n numbers in -(n-1)..(n-1) with sum zero and not more than two numbers equal

%C Column 1 of A188236

%H R. H. Hardin, <a href="/A188228/b188228.txt">Table of n, a(n) for n = 1..31</a>

%e All solutions for n=4

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

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

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

%e ..3....2....1....2....3....3....1....2....3....2....3....1....3....2....2

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 24 2011

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)