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!)
A186594 Number of (n+3)X7 0..3 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock 1
3306753, 104547, 407733, 2526165, 5080629, 5654805, 5711805, 5769381, 5831421, 5959701, 6475413, 9316941, 19268469, 36584472, 55233771, 81033246, 128348841, 198142701, 273483585, 378799581, 578518521, 897620265, 1289310978, 1848325452 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A186599

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..65

FORMULA

Empirical: a(n)=2*a(n-1)-a(n-2)+3*a(n-4)-6*a(n-5)+3*a(n-6)+3*a(n-8)-3*a(n-9) for n>14

EXAMPLE

Some solutions for 5X7

..0..0..0..0..0..3..1....2..0..0..0..0..2..3....0..0..0..0..0..1..3

..0..0..0..0..0..1..3....0..0..0..0..0..0..0....0..0..0..0..0..0..3

..2..0..0..0..0..0..0....0..0..0..0..0..0..3....3..0..0..0..0..0..1

..3..0..0..0..0..0..0....0..0..0..0..0..0..0....2..0..0..0..0..0..0

..2..0..0..0..0..0..0....0..2..0..0..0..0..0....1..3..0..0..0..0..0

CROSSREFS

Sequence in context: A036471 A206316 A186959 * A244574 A250675 A242608

Adjacent sequences:  A186591 A186592 A186593 * A186595 A186596 A186597

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 24 2011

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 August 6 12:33 EDT 2020. Contains 336246 sequences. (Running on oeis4.)