A200943 - OEIS

%I #8 Mar 31 2012 12:36:42

%S 1,7,3,15,46,107,213,383,636,997,1492,2151,3005,4092,5447,7114,9135,

%T 11559,14433,17814,21753,26313,31552,37538,44334,52016,60651,70321,

%U 81100,93075,106325,120945,137018,154645,173916,194937,217803,242628,269511

%N Number of 0..n arrays x(0..3) of 4 elements with nondecreasing average value and 0..n occur with instance counts within one of each other

%C Row 4 of A200942

%H R. H. Hardin, <a href="/A200943/b200943.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 2*a(n-1) +a(n-2) -3*a(n-3) -a(n-4) +a(n-5) +3*a(n-6) -a(n-7) -2*a(n-8) +a(n-9) for n>11

%F Empirical g.f.: x+7x^2 -x^3*(3+9*x+13*x^2+x^4+9*x^3) / ( (1+x+x^2)*(1+x)^2*(x-1)^5 ). - R. J. Mathar, Nov 25 2011

%e Some solutions for n=8

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

%e ..7....3....1....2....1....1....4....5....6....7....4....4....5....2....2....4

%e ..6....2....2....3....5....6....5....4....4....5....5....7....8....8....4....6

%e ..8....4....5....8....4....7....6....8....8....8....7....8....7....4....8....8

%K nonn

%O 1,2

%A _R. H. Hardin_ Nov 24 2011