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 A236821 Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the minimum minus the lower median of every 2X2 subblock equal 1

%I

%S 81,327,1386,6093,27079,121590,549173,2495215,11389842,52223381,

%T 240352711,1110041358,5141952693,23882414527,111181569882,

%U 518644232789,2423637273943,11342969544566,53156257829813,249385929539023

%N Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the minimum minus the lower median of every 2X2 subblock equal

%C Column 1 of A236828

%H R. H. Hardin, <a href="/A236821/b236821.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 9*a(n-1) -2*a(n-2) -167*a(n-3) +265*a(n-4) +1110*a(n-5) -2280*a(n-6) -3350*a(n-7) +7924*a(n-8) +4700*a(n-9) -13072*a(n-10) -2560*a(n-11) +9856*a(n-12) +128*a(n-13) -2560*a(n-14)

%e Some solutions for n=5

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 31 2014

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Last modified March 26 21:04 EDT 2023. Contains 361552 sequences. (Running on oeis4.)