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!)
A193809 Number of n X n symmetric 0..4 arrays with no element equal to the difference mod 5 of any two of its horizontal and vertical neighbors 0
5, 52, 496, 7536, 224792, 13949968, 1780090736, 465161983824, 246624000644912, 263286800959827832, 563752320057171922352, 2417354884909931307656688, 20747077497647444504550311672 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for 4X4

..1..2..2..1....3..4..1..4....3..2..4..4....1..4..3..3....3..2..3..2

..2..2..1..2....4..3..4..3....2..3..2..4....4..3..4..3....2..3..3..2

..2..1..2..2....1..4..3..3....4..2..3..2....3..4..3..3....3..3..2..3

..1..2..2..2....4..3..3..2....4..4..2..3....3..3..3..3....2..2..3..1

CROSSREFS

Sequence in context: A081075 A247766 A247777 * A134111 A071583 A099881

Adjacent sequences:  A193806 A193807 A193808 * A193810 A193811 A193812

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 05 2011

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 17 05:30 EDT 2021. Contains 345080 sequences. (Running on oeis4.)