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 A253987 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal median plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1

%I #4 Jan 21 2015 20:14:17

%S 2736,13188,71116,406183,2136758,11055001,57285940,292920515,

%T 1484002479,7476194054,37444501224,186551627339,925459276687,

%U 4573566632656,22524344983871,110592854608614,541521269124949,2645012332922518

%N Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal median plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally

%C Column 2 of A253993

%H R. H. Hardin, <a href="/A253987/b253987.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 21 2015

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Last modified December 7 21:37 EST 2023. Contains 367662 sequences. (Running on oeis4.)