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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A189439 Number of 7Xn array permutations with each element not moving, or moving one space N, SW or SE 1
1, 85, 1245, 26589, 493941, 9557077, 181540773, 3467525301, 66045131269, 1258981901653, 23988387057381, 457127606313333, 8710469146675973, 165979359956189589, 3162723963901817637, 60265641669988070325 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 7 of A189435

LINKS

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

FORMULA

Empirical: a(n) = 23*a(n-1) +26*a(n-2) -2256*a(n-3) +3272*a(n-4) +63936*a(n-5) -101752*a(n-6) -714624*a(n-7) +1041216*a(n-8) +3522752*a(n-9) -4444032*a(n-10) -7691264*a(n-11) +5545472*a(n-12) +11157504*a(n-13) -4947968*a(n-14) -4030464*a(n-15)

EXAMPLE

Some solutions for 7X3

..0..1..2....3..1..2....3..1..2....0..1..2....0..1..2....3..4..2....0..1..2

..3..7..8....6..0..5....6..0..5....3..4..5....3..4..5....1..0..5....6..7..5

..6..5..4....9..7..4....4.10.11....6..7..8....6..7.11....6.10.11....4..3..8

..9.13.14...12..8.14....9..8..7...12.13.11...12..8.14....7..8.14....9.13.14

.12.11.10...15.11.10...12.13.17...10..9.14...15..9.10...12..9.17...12.11.10

.15.19.20...13.19.20...15.14.20...15.19.20...18.19.13...18.19.13...18.19.17

.18.17.16...18.17.16...18.19.16...18.17.16...16.17.20...16.15.20...16.15.20

CROSSREFS

Sequence in context: A206163 A020239 A297587 * A166917 A206377 A008360

Adjacent sequences:  A189436 A189437 A189438 * A189440 A189441 A189442

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 22 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 August 20 18:56 EDT 2019. Contains 326154 sequences. (Running on oeis4.)