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Number of (n+1) X (2+1) 0..3 arrays with no 2X2 2 X 2 subblock having its maximum diagonal element less than its minimum antidiagonal element.
Column 2 of A251283
Empirical: a(n) = 54*a(n-1) - 182*a(n-2) + 228*a(n-3) + 1152*a(n-4).
Empirical g.f.: 64*x*(51 - 179*x + 246*x^2 + 1152*x^3) / (1 - 54*x + 182*x^2 - 228*x^3 - 1152*x^4). - Colin Barker, Nov 27 2018
Some solutions for n=2:
Column 2 of A251283.
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R. H. Hardin, <a href="/A251277/b251277.txt">Table of n, a(n) for n = 1..210</a>
allocated for R. H. Hardin
Number of (n+1)X(2+1) 0..3 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element
3264, 164800, 8320896, 420152704, 21215177472, 1071238805248, 54091113672192, 2731275752121856, 137912990258285568, 6963776128082148352, 351628790523862185984, 17755138024422940530688, 896527630165476145606656
1,1
Column 2 of A251283
Empirical: a(n) = 54*a(n-1) -182*a(n-2) +228*a(n-3) +1152*a(n-4)
Some solutions for n=2
..0..0..2....3..0..0....1..3..2....1..2..0....1..3..0....1..1..3....1..3..0
..1..2..3....3..1..1....0..2..2....2..3..2....0..0..1....0..1..1....0..0..2
..0..0..3....3..0..3....0..1..3....3..3..2....2..1..2....2..1..0....2..3..3
allocated
nonn
R. H. Hardin, Dec 01 2014
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