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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A189448 Number of nX8 array permutations with each element moving zero or one space horizontally or diagonally 1
34, 11705, 2455013, 569476049, 129699382789, 29628810704689, 6765736745152657, 1544933702911323688, 352785827356726984192, 80558653487951364549221, 18395575161567635569195834, 4200631099715909550808300301 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 8 of A189449

LINKS

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

FORMULA

Empirical: a(n) = 271*a(n-1) -9281*a(n-2) -132793*a(n-3) +6435503*a(n-4) +6180631*a(n-5) -1532732417*a(n-6) +31313049127*a(n-7) -572074427641*a(n-8) +7170704782047*a(n-9) -51266858495897*a(n-10) +231917665131791*a(n-11) -707422794603657*a(n-12) +1512758157163207*a(n-13) -2416565333435121*a(n-14) +3828566087055831*a(n-15) -4502939947225841*a(n-16) +2761124753871575*a(n-17) -3103177724436865*a(n-18) +2492986861400335*a(n-19) -3031830947082385*a(n-20) +3031830947082385*a(n-21) -2492986861400335*a(n-22) +3103177724436865*a(n-23) -2761124753871575*a(n-24) +4502939947225841*a(n-25) -3828566087055831*a(n-26) +2416565333435121*a(n-27) -1512758157163207*a(n-28) +707422794603657*a(n-29) -231917665131791*a(n-30) +51266858495897*a(n-31) -7170704782047*a(n-32) +572074427641*a(n-33) -31313049127*a(n-34) +1532732417*a(n-35) -6180631*a(n-36) -6435503*a(n-37) +132793*a(n-38) +9281*a(n-39) -271*a(n-40) +a(n-41) for n>43

EXAMPLE

Some solutions for 3X8

..0..1..2..3.13..5..7..6....0..1..2..3..4..5..6..7....0..1.11..2..5..4..6..7

..8..9.10.11.21..4.15.14....8..9.11.10.13.12.15.14....8.10..9.12..3.13.15.14

.16.18.17.20.19.12.22.23...16.18.17.20.19.21.22.23...16.17.18.19.21.20.23.22

CROSSREFS

Sequence in context: A005334 A033511 A246240 * A214368 A220870 A223040

Adjacent sequences:  A189445 A189446 A189447 * A189449 A189450 A189451

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 | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified November 22 23:40 EST 2014. Contains 249835 sequences.