login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A260539 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010001 1
193, 310, 774, 1411, 2226, 5592, 11370, 18899, 40776, 88106, 155906, 309795, 670458, 1259060, 2411996, 5101845, 9988886, 18999278, 39063112, 78266591, 150050760, 301477144, 608976908, 1182523707, 2342361446, 4726202066, 9284557350 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A260544

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-3) +6*a(n-4) +a(n-5) -5*a(n-6) -9*a(n-7) -13*a(n-8) +7*a(n-9) +10*a(n-10) -3*a(n-11) +3*a(n-12) -10*a(n-13) -16*a(n-14) -14*a(n-15) -3*a(n-16) -2*a(n-17) -a(n-18) +4*a(n-19) for n>22

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260544

Sequence in context: A146360 A050964 A015988 * A142743 A014755 A238667

Adjacent sequences:  A260536 A260537 A260538 * A260540 A260541 A260542

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 28 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 18 20:08 EDT 2021. Contains 348069 sequences. (Running on oeis4.)