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!)
A260101 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010101 1
206, 477, 1136, 2768, 6878, 17125, 42372, 104772, 258690, 639184, 1578958, 3902316, 9640990, 23821537, 58852874, 145410924, 359251828, 887606592, 2192956508, 5418102592, 13386231028, 33072997411, 81712020092, 201883197204 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A260106

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-2) +3*a(n-3) +13*a(n-4) +9*a(n-5) -a(n-6) -15*a(n-7) -85*a(n-8) -97*a(n-9) -130*a(n-10) -106*a(n-11) +6*a(n-12) +115*a(n-13) +537*a(n-14) +649*a(n-15) +592*a(n-16) +680*a(n-17) -2*a(n-18) -661*a(n-19) -954*a(n-20) -1415*a(n-21) -1370*a(n-22) -746*a(n-23) +52*a(n-24) +491*a(n-25) +557*a(n-26) +394*a(n-27) -41*a(n-28) -119*a(n-29) +32*a(n-30) +38*a(n-31) -2*a(n-32) +6*a(n-34) for n>35

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260106

Sequence in context: A222619 A252270 A113934 * A113490 A054007 A285754

Adjacent sequences:  A260098 A260099 A260100 * A260102 A260103 A260104

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 16 2015

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 January 19 22:12 EST 2022. Contains 350466 sequences. (Running on oeis4.)