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!)
A251027 Number of (n+1)X(7+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements 1

%I

%S 126955,334167,608267,1199576,2203974,4230166,7948184,15543033,

%T 30783775,63428115,133806457,290589257,642273542,1441935948,

%U 3266407237,7449665312,17053708629,39139562962,89950860174,206910386515,476167313927

%N Number of (n+1)X(7+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements

%C Column 7 of A251028

%H R. H. Hardin, <a href="/A251027/b251027.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 8*a(n-1) -25*a(n-2) +35*a(n-3) -7*a(n-4) -49*a(n-5) +77*a(n-6) -55*a(n-7) +20*a(n-8) -3*a(n-9) for n>14

%e Some solutions for n=1

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Nov 29 2014

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 5 11:53 EDT 2022. Contains 357255 sequences. (Running on oeis4.)