login
This site is supported by donations to The OEIS Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A185480 Number of (n+1)X3 binary arrays with every 2X2 subblock determinant equal to some horizontal or vertical neighbor 2X2 subblock determinant 1
30, 148, 684, 3262, 15402, 73094, 346356, 1642258, 7785218, 36909314, 174980330, 829558720, 3932814406, 18644913662, 88392840864, 419057759044, 1986692502674, 9418623349146, 44652337958296, 211690309447022, 1003593296864578 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A185487

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n)=8*a(n-1)-17*a(n-2)+a(n-3)+43*a(n-4)-71*a(n-5)+48*a(n-6)-9*a(n-7)-4*a(n-8)+10*a(n-9)-2*a(n-10) for n>12

EXAMPLE

Some solutions for 5X3

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

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

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

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

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

CROSSREFS

Sequence in context: A126417 A135175 A186895 * A316459 A206040 A042760

Adjacent sequences:  A185477 A185478 A185479 * A185481 A185482 A185483

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 28 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 December 6 16:24 EST 2019. Contains 329808 sequences. (Running on oeis4.)