login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A256746 Number of (n+2)X(6+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
12914, 12280, 16560, 18688, 47440, 72192, 155792, 255488, 600080, 869632, 2236176, 3351808, 8175376, 12600576, 31831312, 46718208, 122490640, 182095104, 471224592, 698647808, 1859822352, 2698396928, 7245722896, 10683665664 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A256748

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = -2*a(n-1) +4*a(n-2) +24*a(n-3) +27*a(n-4) -70*a(n-5) -198*a(n-6) -88*a(n-7) +408*a(n-8) +648*a(n-9) -48*a(n-10) -896*a(n-11) -704*a(n-12) +384*a(n-13) +512*a(n-14) for n>18

EXAMPLE

Some solutions for n=4

..1..0..0..1..0..1..1..0....1..1..1..0..1..1..1..0....1..1..1..0..1..1..1..0

..1..1..1..1..0..0..1..1....0..1..0..1..0..1..0..0....0..1..0..1..0..1..0..0

..1..0..0..1..1..1..0..0....0..1..0..1..0..1..0..1....0..1..0..1..0..1..0..1

..1..1..1..1..0..0..1..1....1..0..1..0..1..0..1..0....1..0..1..0..1..0..1..0

..1..0..0..1..1..1..0..0....0..0..1..0..1..0..1..0....1..0..1..0..1..0..1..0

..1..0..1..1..0..0..1..1....1..1..1..1..1..1..0..1....1..1..0..1..0..1..1..1

CROSSREFS

Cf. A256748

Sequence in context: A185885 A212079 A162895 * A086004 A090887 A246890

Adjacent sequences:  A256743 A256744 A256745 * A256747 A256748 A256749

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 09 2015

STATUS

approved

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 June 21 19:12 EDT 2021. Contains 345365 sequences. (Running on oeis4.)