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!)
A204964 Number of (n+2)X3 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally at least two different ways, and new values 0..1 introduced in row major order 1
166, 1001, 6086, 36522, 219755, 1323027, 7962992, 47928592, 288482790, 1736374118, 10451212777, 62905729186, 378628840855, 2278962509607, 13717048411662, 82562752244975, 496944229784914, 2991101444785801 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A204971

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 6*a(n-1) +6*a(n-3) -28*a(n-4) -25*a(n-5) +4*a(n-6) +2*a(n-7) +85*a(n-8) -46*a(n-9) +68*a(n-10) +46*a(n-11) -20*a(n-12) +12*a(n-13) -48*a(n-14) +16*a(n-15)

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A051963 A033675 A204971 * A241969 A193984 A144380

Adjacent sequences:  A204961 A204962 A204963 * A204965 A204966 A204967

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 21 2012

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 August 11 19:26 EDT 2022. Contains 356066 sequences. (Running on oeis4.)