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Number of nondecreasing -4..4 vectors of length n whose dot product with some nonincreasing -4..4 vector equals n
0

%I #3 Jun 06 2013 06:36:19

%S 2,32,120,448,874,2498,4280,10992,18566,32056,52408,107154,142740,

%T 232578

%N Number of nondecreasing -4..4 vectors of length n whose dot product with some nonincreasing -4..4 vector equals n

%C Column 4 of A226398

%e Some solutions for n=3

%e .-4....2...-3...-4...-3...-3...-4....1...-2....1...-3....0....0...-1...-3...-2

%e .-3....3...-2....0...-2....2...-1....4...-2....1....4....1....3...-1...-3...-1

%e .-3....3....3....3....0....2....2....4....1....1....4....1....3...-1...-2....0

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 06 2013