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!)
A253740 T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with every 2X2 and 3X3 subblock diagonal sum minus antidiagonal sum unequal to its neighbors horizontally and vertically 9
218, 720, 720, 2212, 1888, 2212, 6932, 4100, 4100, 6932, 22236, 9876, 7216, 9876, 22236, 70372, 25012, 17608, 17608, 25012, 70372, 222820, 60296, 44332, 54688, 44332, 60296, 222820, 706884, 148328, 102616, 143080, 143080, 102616, 148328 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

.....218.....720....2212.....6932....22236.....70372.....222820......706884

.....720....1888....4100.....9876....25012.....60296.....148328......369360

....2212....4100....7216....17608....44332....102616.....243796......599920

....6932....9876...17608....54688...143080....345304.....922004.....2750948

...22236...25012...44332...143080...400068...1059528....3230352....10458356

...70372...60296..102616...345304..1059528...3369876...11094376....37875928

..222820..148328..243796...922004..3230352..11094376...40265740...158864740

..706884..369360..599920..2750948.10458356..37875928..158864740...774250356

.2242532..917504.1495128..7532104.31345596.127687424..622829668..3357130068

.7110804.2284292.3650772.19629020.90751832.433506104.2349461712.13604064576

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..337

FORMULA

Empirical for column k:

k=1: [linear recurrence of order 14] for n>15

k=2: [order 55] for n>60

EXAMPLE

Some solutions for n=4 k=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A038595 A045239 A185462 * A253733 A241102 A292545

Adjacent sequences:  A253737 A253738 A253739 * A253741 A253742 A253743

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Jan 11 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 July 23 22:20 EDT 2021. Contains 346265 sequences. (Running on oeis4.)