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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A189605 Number of nX4 array permutations with each element not moving, or moving one space E, S or NW 1
1, 13, 72, 464, 2853, 17617, 108785, 671452, 4144996, 25586605, 157944449, 974979853, 6018479996, 37151644524, 229334423389, 1415664871777, 8738797243193, 53943965676260, 332992213004236, 2055536935944305 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A189610

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 7*a(n-1) -3*a(n-2) -12*a(n-3) -11*a(n-4) +34*a(n-5) -27*a(n-6) +9*a(n-7) +7*a(n-8) +49*a(n-9) -82*a(n-10) +84*a(n-11) -54*a(n-12) +21*a(n-13) -6*a(n-14) +a(n-15)

EXAMPLE

Some solutions for 3X4

..0..1..7..2....5..0..2..3....0..6..2..3....5..6..7..2....0..6..1..2

..4..5..6..3....4..1.11..6....9..1..5..7....0..1.11..3....9..5.11..3

..8..9.10.11....8..9.10..7....4..8.10.11....4..8..9.10....4..8.10..7

CROSSREFS

Sequence in context: A026916 A106173 A094943 * A000470 A297905 A298499

Adjacent sequences:  A189602 A189603 A189604 * A189606 A189607 A189608

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 24 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 16 11:49 EDT 2019. Contains 324152 sequences. (Running on oeis4.)