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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A261551 Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001011. 1
336, 484, 754, 769, 816, 1286, 1510, 1615, 2362, 3215, 3431, 4393, 7048, 7780, 8410, 13211, 16608, 17829, 24668, 36190, 39242, 46637, 73624, 86018, 93335, 138721, 186633, 201052, 260339, 393430, 441304, 504693, 773636, 962188, 1043739, 1459993 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A261553.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-7) +4*a(n-10) +2*a(n-13) -3*a(n-14) -2*a(n-17) +a(n-20) -4*a(n-21) -4*a(n-23) -8*a(n-24) -a(n-26) -6*a(n-27) +3*a(n-28) +3*a(n-34) +2*a(n-35) +2*a(n-38) for n>44

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A261553.

Sequence in context: A090487 A289220 A060664 * A247530 A064259 A181256

Adjacent sequences:  A261548 A261549 A261550 * A261552 A261553 A261554

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 24 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 April 22 08:25 EDT 2019. Contains 322329 sequences. (Running on oeis4.)