A237970 - OEIS

A237970

Number of (n+1) X (4+1) 0..3 arrays with the upper median of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.

%I #6 Aug 08 2023 14:07:49

%S 40442,357672,2609908,25087700,255374826,2480183866,24232087766,

%T 242591959184,2393881373820,23436165715384,231406144872410,

%U 2289251323274992,22505424261636832,221515001897626222

%N Number of (n+1) X (4+1) 0..3 arrays with the upper median of every 2 X 2 subblock differing from its horizontal and vertical neighbors by exactly one.

%C Column 4 of A237974.

%H R. H. Hardin, <a href="/A237970/b237970.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=1

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

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

%Y Cf. A237974.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 16 2014