A236521 - OEIS

A236521

Number of (n+1)X(6+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise.

%I #6 Jul 23 2025 09:19:26

%S 4020,108214,2728079,63997604,1448355717,31459840764,668463714817,

%T 13878535769685,284431385172713,5756312538787583,115657256984698963,

%U 2308624191351314296,45907689651660537908,909911916639050545637

%N Number of (n+1)X(6+1) 0..1 arrays with the difference of the upper median and minimum value of each 2X2 subblock in lexicographically nondecreasing order columnwise and nonincreasing rowwise.

%C Column 6 of A236523

%H R. H. Hardin, <a href="/A236521/b236521.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=2

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 27 2014