A184434 - OEIS

%I #5 Mar 31 2012 12:35:59

%S 1,1,3,5,8,17,31,63,129,244,458,860,1544,2721,4734,8044,13423,22097,

%T 35750,57052,89944,139918,215240,327754,493888,737327,1091368,1601767,

%U 2332587,3372198,4840788,6903176,9783032,13780976,19302810,26891801

%N Number of strings of numbers x(i=1..n) in 0..2 with sum i*x(i)^2 equal to n*4

%C Column 2 of A184441

%H R. H. Hardin, <a href="/A184434/b184434.txt">Table of n, a(n) for n = 1..200</a>

%e All solutions for n=5

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

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Jan 14 2011