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!)
A252859 Number of (n+2)X(6+2) 0..2 arrays with every consecutive three elements in every row, column, diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order 1
11286, 4986, 6795, 13590, 28728, 60588, 126306, 266391, 562293, 1185867, 2491002, 5266044, 11098008, 23380335, 49262301, 103991625, 219100158, 461718972, 973617264, 2053180017, 4326686289, 9121144149, 19232567028, 40543286472 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A252861

LINKS

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

FORMULA

Empirical: a(n) = -a(n-1) +4*a(n-3) +16*a(n-4) +16*a(n-5) +9*a(n-6) -11*a(n-7) -58*a(n-8) -64*a(n-9) -14*a(n-10) +79*a(n-11) +143*a(n-12) +104*a(n-13) +13*a(n-14) -101*a(n-15) -124*a(n-16) -74*a(n-17) +2*a(n-18) +34*a(n-19) +28*a(n-20) +8*a(n-21) -4*a(n-22) -4*a(n-23) for n>26

EXAMPLE

Some solutions for n=4

..0..1..0..1..1..2..1..2....0..0..1..1..2..2..0..0....0..0..1..0..1..0..0..2

..2..0..0..2..2..1..1..0....0..1..0..0..2..0..2..2....1..0..0..2..2..0..0..1

..2..1..2..1..2..2..0..2....2..0..0..1..1..2..2..0....1..2..1..2..1..2..1..2

..1..1..2..2..1..1..0..0....2..1..1..0..1..0..0..2....2..2..1..1..2..2..1..1

..1..2..1..2..1..2..1..2....0..0..1..1..2..2..0..2....1..1..2..1..2..1..2..2

..0..2..2..0..0..1..1..2....0..1..0..0..2..2..1..1....2..1..1..0..0..2..2..1

CROSSREFS

Sequence in context: A195654 A195649 A110375 * A177216 A112441 A104017

Adjacent sequences:  A252856 A252857 A252858 * A252860 A252861 A252862

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 23 2014

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 11 00:03 EDT 2021. Contains 342877 sequences. (Running on oeis4.)