login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A186897 Number of (n+1)X5 binary arrays with every 2X2 subblock determinant equal to exactly one or two horizontal and vertical neighbor 2X2 subblock determinants 1
234, 406, 1692, 5401, 14437, 49303, 171877, 608194, 1974583, 6828851, 23697904, 82511604, 280821141, 969113166, 3356595204, 11627225657, 40028089405, 138218574688, 478039503452, 1653233404522, 5707628406749, 19717537044734 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A186902
LINKS
FORMULA
Empirical: a(n)=2*a(n-1)+4*a(n-2)+a(n-3)+55*a(n-4)-71*a(n-5)-270*a(n-6)-75*a(n-7)-541*a(n-8)+92*a(n-9)+3469*a(n-10)+2523*a(n-11)-1411*a(n-12)+2361*a(n-13)-3307*a(n-14)-5191*a(n-15)+46033*a(n-16)+47267*a(n-17)-24164*a(n-18)-25983*a(n-19)-130840*a(n-20)-344285*a(n-21)-394773*a(n-22)-421021*a(n-23)-365160*a(n-24)-79912*a(n-25)-75973*a(n-26)-81330*a(n-27)+49938*a(n-28)-268895*a(n-29)-35251*a(n-30)-11215*a(n-31)-844391*a(n-32)-825334*a(n-33)-963512*a(n-34)-938042*a(n-35)+244059*a(n-36)+455064*a(n-37)+214925*a(n-38)+142856*a(n-39)-242661*a(n-40)-340438*a(n-41)-154625*a(n-42)+10260*a(n-43)+74203*a(n-44)+100145*a(n-45)+49482*a(n-46)+8674*a(n-47)+9592*a(n-48)+3430*a(n-49)-305*a(n-50)+1258*a(n-51)+598*a(n-52)-100*a(n-53)-77*a(n-54)-21*a(n-55)-4*a(n-56) for n>62
EXAMPLE
Some solutions for 3X5
..0..1..0..0..1....0..1..1..0..0....0..1..0..0..1....1..1..1..1..0
..0..1..1..0..1....0..0..1..1..1....1..1..1..0..1....0..0..0..1..1
..0..0..1..0..0....0..0..0..0..0....1..0..1..0..0....0..1..1..1..0
CROSSREFS
Sequence in context: A269548 A264021 A256086 * A184450 A338391 A304615
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 29 02:52 EST 2024. Contains 370401 sequences. (Running on oeis4.)