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!)
A278855 T(n,k)=Number of nXk 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes. 8
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 25, 66, 25, 0, 1, 239, 1348, 1348, 239, 1, 8, 1486, 15066, 30772, 15066, 1486, 8, 36, 7072, 118158, 449677, 449677, 118158, 7072, 36, 120, 27828, 731444, 4950399, 9317846, 4950399, 731444, 27828, 120, 330, 94720, 3813048 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,12

COMMENTS

Table starts

...0.....0........0..........0............0..............1................8

...0.....0........1.........25..........239...........1486.............7072

...0.....1.......66.......1348........15066.........118158...........731444

...0....25.....1348......30772.......449677........4950399.........44571591

...0...239....15066.....449677......9317846......154090507.......2167109763

...1..1486...118158....4950399....154090507.....4026240722......92891826961

...8..7072...731444...44571591...2167109763....92891826961....3637198028018

..36.27828..3813048..344302564..26799758534..1935392159582..131770344218055

.120.94720.17413532.2353207764.297417275848.36831668321915.4438698421228261

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..219

FORMULA

Empirical for column k:

k=1: [polynomial of degree 7]

k=2: [polynomial of degree 14]

k=3: [polynomial of degree 27]

k=4: [polynomial of degree 52]

k=5: [polynomial of degree 101]

EXAMPLE

Some solutions for n=4 k=4

..1..0..1..0. .1..1..1..0. .1..0..0..0. .1..0..0..0. .1..1..1..1

..0..0..1..0. .0..1..1..0. .1..0..1..0. .1..0..1..0. .0..1..0..0

..0..0..0..1. .0..0..0..1. .1..0..0..0. .1..0..0..1. .1..1..1..0

..1..0..1..1. .0..1..0..1. .0..1..0..0. .1..0..0..0. .0..1..1..1

CROSSREFS

Column 1 is A000580(n+1).

Sequence in context: A033682 A020283 A211462 * A137186 A109676 A223888

Adjacent sequences:  A278852 A278853 A278854 * A278856 A278857 A278858

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Nov 29 2016

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 21 00:26 EDT 2021. Contains 345327 sequences. (Running on oeis4.)