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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A183779 Half the number of (n+1)X7 binary arrays with no 2X2 subblock having exactly 2 ones 1
557, 6887, 74148, 864671, 9764363, 112439612, 1284649009, 14750484447, 169027656900, 1939448495087, 22241611726431, 255158474995768, 2926771174469677, 33574663298792895, 385137356737681316 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A183782

LINKS

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

FORMULA

Empirical: a(n)=17*a(n-1)+68*a(n-2)-2331*a(n-3)+2715*a(n-4)+127282*a(n-5)-407543*a(n-6)-3552923*a(n-7)+16967238*a(n-8)+53329851*a(n-9)-373159393*a(n-10)-374852552*a(n-11)+5020944360*a(n-12)-530953324*a(n-13)-44088857196*a(n-14)+35340877520*a(n-15)+260439199152*a(n-16)-343900816832*a(n-17)-1042238954144*a(n-18)+1873164312128*a(n-19)+2773317482368*a(n-20)-6583718366464*a(n-21)-4584267066368*a(n-22)+15516200251392*a(n-23)+3621536735232*a(n-24)-24598780526592*a(n-25)+1537459224576*a(n-26)+25766309396480*a(n-27)-6673413963776*a(n-28)-17180213116928*a(n-29)+6712291491840*a(n-30)+6848728006656*a(n-31)-3277395591168*a(n-32)-1448477720576*a(n-33)+776315338752*a(n-34)+120259084288*a(n-35)-68719476736*a(n-36)

EXAMPLE

Some solutions with a(1,1)=0 for 3X7

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

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

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

CROSSREFS

Sequence in context: A233355 A177331 A105979 * A071393 A206123 A185772

Adjacent sequences:  A183776 A183777 A183778 * A183780 A183781 A183782

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 07 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified November 29 01:24 EST 2014. Contains 250479 sequences.