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 A184021 1/8 the number of (n+1)X2 0..3 arrays with all 2X2 subblock sums the same 1

%I #5 Mar 31 2012 12:35:56

%S 32,88,242,748,2312,7684,25538,89044,310472,1119748,4038482,14931868,

%T 55209032,207984844,783525698,2994047524,11441003912,44197635508,

%U 170739473522,665105634988,2590880108552,10157230949404,39820190914658

%N 1/8 the number of (n+1)X2 0..3 arrays with all 2X2 subblock sums the same

%C Column 1 of A184029

%H R. H. Hardin, <a href="/A184021/b184021.txt">Table of n, a(n) for n = 1..200</a>

%F Empirical: a(n)=8*a(n-1)+16*a(n-2)-268*a(n-3)+189*a(n-4)+3388*a(n-5)-5824*a(n-6)-20048*a(n-7)+49756*a(n-8)+52752*a(n-9)-196896*a(n-10)-24192*a(n-11)+369216*a(n-12)-131328*a(n-13)-262656*a(n-14)+165888*a(n-15)

%e Some solutions for 4X2

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 08 2011

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Last modified May 30 08:27 EDT 2023. Contains 363050 sequences. (Running on oeis4.)