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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A260835 Number of (n+2)X(2+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101 1
82, 131, 288, 496, 796, 1645, 2976, 4890, 9332, 17659, 30090, 54846, 104380, 184549, 329454, 618800, 1121728, 1998197, 3692344, 6772932, 12142202, 22172787, 40769872, 73664484, 133728146, 245325455, 445857864, 808254626, 1477620470 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A260841

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +5*a(n-3) -a(n-4) -3*a(n-5) -5*a(n-6) +3*a(n-9) -2*a(n-10) -5*a(n-11) -2*a(n-12) -a(n-13) +5*a(n-14) -2*a(n-15) -2*a(n-17) +2*a(n-18) for n>19

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A260841

Sequence in context: A223088 A039547 A029704 * A173087 A264352 A044252

Adjacent sequences:  A260832 A260833 A260834 * A260836 A260837 A260838

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 01 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 October 17 19:18 EDT 2019. Contains 328127 sequences. (Running on oeis4.)