login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A254021 Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1

%I

%S 2540,7212,23295,81959,261188,806538,2368198,6624259,17894542,

%T 46475759,117362361,289972349,700430787,1660287016,3874041941,

%U 8916784297,20277482009,45635984351,101763767073,225107832296,494489541033

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

%C Row 2 of A254020

%H R. H. Hardin, <a href="/A254021/b254021.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 22 2015

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 19 04:56 EST 2022. Contains 350464 sequences. (Running on oeis4.)