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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A188808 T(n,k)=Number of nXk array permutations with each element remaining in its original row or its original column 3
1, 2, 2, 6, 9, 6, 24, 82, 82, 24, 120, 1313, 2720, 1313, 120, 720, 32826, 194568, 194568, 32826, 720, 5040, 1181737, 26101232, 72104097, 26101232, 1181737, 5040, 40320, 57905114, 5919004912, 57951767544, 57951767544, 5919004912, 57905114, 40320 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Table starts

.....1........2..........6..........24.........120........720..........5040

.....2........9.........82........1313.......32826....1181737......57905114

.....6.......82.......2720......194568....26101232.5919004912.2103543163584

....24.....1313.....194568....72104097.57951767544

...120....32826...26101232.57951767544

...720..1181737.5919004912

..5040.57905114

.40320

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..39

EXAMPLE

Some solutions for 4X3

..3..2.11....3..0..8....0.10..8....3..0..1....0.10.11....0..4..8....1..2..0

..9..1..4....4..1..5....6..7..3....9..7.11....6..5..4....3..1..5....6..4..5

..6..8..7....7..6.11....9..4..5....8.10..5....9..8..7....6..7..2....9..7..8

..0.10..5...10..9..2...11..1..2....6..4..2....3..1..2...11.10..9....3.10.11

CROSSREFS

Column 1 is A000142

Column 2 is A006040(n+1)

Sequence in context: A094485 A242978 A231137 * A021819 A000021 A000022

Adjacent sequences:  A188805 A188806 A188807 * A188809 A188810 A188811

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Apr 11 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 December 8 09:53 EST 2019. Contains 329862 sequences. (Running on oeis4.)