A188003 - OEIS

%I #5 Mar 31 2012 12:36:10

%S 3,4,5,8,9,10,11,12,15,16,17,20,21,24,25,28,29,30,33,34,35,36,37,42,

%T 45,46,47,50,53,54,55,56,59,62,63,66,67,70,73,76,77,78,79,82,83,84,85,

%U 86,91,94,97,100,101,104,105,106,109,110,113,116,117,118,119,128,129,130,133

%N Number of nondecreasing arrangements of 3 numbers x(i) in -(n+1)..(n+1) with the sum of sign(x(i))*x(i)^2 zero

%C Row 3 of A188002

%H R. H. Hardin, <a href="/A188003/b188003.txt">Table of n, a(n) for n = 1..200</a>

%e All solutions for 3X1

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

%e ..0....0....0....0....0

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 18 2011