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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A260172 Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00010001 1
183, 419, 1054, 2598, 6813, 17889, 46263, 119681, 316052, 821743, 2142670, 5594790, 14648190, 38111650, 99634628, 260110994, 679357192, 1771602718, 4630032186, 12081675926, 31547816516, 82338811496, 215053875128, 561241973258 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A260177

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) +14*a(n-4) -a(n-5) +18*a(n-6) +51*a(n-7) -28*a(n-8) -89*a(n-9) +185*a(n-10) -62*a(n-11) -246*a(n-12) +30*a(n-13) -128*a(n-14) -113*a(n-15) +80*a(n-16) -301*a(n-17) -83*a(n-18) -50*a(n-19) -118*a(n-20) +118*a(n-21) +48*a(n-22) -86*a(n-23) +38*a(n-24) +30*a(n-25) -6*a(n-26) +2*a(n-27) -4*a(n-30) for n>31

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260177

Sequence in context: A147270 A147124 A261110 * A252070 A193253 A272126

Adjacent sequences:  A260169 A260170 A260171 * A260173 A260174 A260175

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 17 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 June 25 17:47 EDT 2019. Contains 324353 sequences. (Running on oeis4.)