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!)
A208431 Number of nX5 0..2 arrays with new values 0..2 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors) 1
41, 864, 1123, 6416, 50507, 365195, 2623167, 19281232, 141789341, 1037399092, 7598755762, 55697097923, 408217653315, 2991035581961, 21919561041622, 160626736704557, 1177121839740932, 8625904039667696, 63212673380523055 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A208434

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +17*a(n-2) -201*a(n-3) +448*a(n-4) -1627*a(n-5) +1693*a(n-6) +22432*a(n-7) -60066*a(n-8) +45696*a(n-9) +32264*a(n-10) -697137*a(n-11) +1671442*a(n-12) -378862*a(n-13) -2203329*a(n-14) +8634970*a(n-15) -17270425*a(n-16) +2222078*a(n-17) +16804877*a(n-18) -40251356*a(n-19) +104103432*a(n-20) -64341121*a(n-21) -37339570*a(n-22) +110797160*a(n-23) -350390806*a(n-24) +352758000*a(n-25) -4026468*a(n-26) -221511112*a(n-27) +581590756*a(n-28) -647331256*a(n-29) +39507416*a(n-30) +335397720*a(n-31) -417266928*a(n-32) +342507344*a(n-33) +68614176*a(n-34) -240816608*a(n-35) +52389024*a(n-36) +43953792*a(n-37) -21497088*a(n-38) +4329216*a(n-39) +746496*a(n-40) -746496*a(n-41) for n>45

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A162178 A162403 A010993 * A275355 A289854 A228257

Adjacent sequences:  A208428 A208429 A208430 * A208432 A208433 A208434

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 26 2012

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 21 01:48 EDT 2021. Contains 348137 sequences. (Running on oeis4.)