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!)
A260606 Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101 1
525, 1136, 3343, 8736, 26148, 70906, 217376, 587980, 1803868, 4887108, 15001422, 40649252, 124739782, 337833308, 1037043054, 2809741952, 8622275444, 23356067132, 71689360248, 194209294956, 596026346284, 1614617758884 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A260609

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-2) +46*a(n-4) -64*a(n-6) -380*a(n-8) +1850*a(n-10) +977*a(n-12) -18257*a(n-14) +30378*a(n-16) +47861*a(n-18) -234270*a(n-20) +259685*a(n-22) +208969*a(n-24) -296873*a(n-26) -430900*a(n-28) +647482*a(n-30) +752390*a(n-32) -398354*a(n-34) -706438*a(n-36) +135125*a(n-38) +924468*a(n-40) +365677*a(n-42) -415302*a(n-44) -1572792*a(n-46) +179717*a(n-48) +350505*a(n-50) +449303*a(n-52) -78094*a(n-54) +141078*a(n-56) -70816*a(n-58) -112028*a(n-60) -37664*a(n-62) -11652*a(n-64) -3044*a(n-66) -896*a(n-68) -496*a(n-70) -64*a(n-72) for n>75

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A260609

Sequence in context: A125012 A281549 A308242 * A181112 A152464 A284961

Adjacent sequences:  A260603 A260604 A260605 * A260607 A260608 A260609

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 29 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 September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)