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!)
A256743 Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum 3 and no antidiagonal sum 3 and no row sum 0 and no column sum 0 1

%I #4 Apr 09 2015 14:42:32

%S 857,1564,2992,3752,9112,16560,38376,61376,135552,202832,517472,

%T 837568,2004832,3082192,7494688,11500352,29366208,44880848,112714720,

%U 169674112,434165792,652380752,1696204320,2515078784,6570529664,9672961104

%N Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum 3 and no antidiagonal sum 3 and no row sum 0 and no column sum 0

%C Column 3 of A256748

%H R. H. Hardin, <a href="/A256743/b256743.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = a(n-1) +4*a(n-2) +2*a(n-3) -5*a(n-4) -17*a(n-5) +20*a(n-6) -40*a(n-7) -28*a(n-8) +16*a(n-9) +176*a(n-10) +128*a(n-11) -256*a(n-12) for n>17

%e Some solutions for n=4

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

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

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

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

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

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

%Y Cf. A256748

%K nonn

%O 1,1

%A _R. H. Hardin_, Apr 09 2015

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 March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)