login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A224017 Number of 7Xn 0..2 arrays with rows nondecreasing and antidiagonals unimodal 1
2187, 279936, 4549684, 32148473, 157347899, 630339756, 2200064042, 6905100668, 19884396658, 53273320570, 134149069532, 319991143494, 727540081476, 1584708043525, 3320910477511, 6719637130491, 13169292526095, 25065634112639 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A224012

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = (118519/21794572800)*n^14 + (93527/444787200)*n^13 + (611041/119750400)*n^12 + (20516659/239500800)*n^11 + (983303/907200)*n^10 + (76863193/7257600)*n^9 + (6226908251/76204800)*n^8 + (10267137467/21772800)*n^7 + (44655148529/21772800)*n^6 + (59149317869/10886400)*n^5 + (6745497467/1108800)*n^4 - (150827667029/9979200)*n^3 - (38880748217/10090080)*n^2 + (55017835997/360360)*n + 124353 for n>5

EXAMPLE

Some solutions for n=3

..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0

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

..1..1..2....0..1..2....0..2..2....1..1..2....0..1..2....0..1..2....0..1..2

..0..1..1....1..1..1....1..1..1....0..0..0....2..2..2....0..1..2....2..2..2

..1..1..1....0..2..2....1..1..2....0..1..2....0..1..1....1..1..1....1..1..2

..1..2..2....0..1..1....1..1..1....1..1..1....0..2..2....0..0..1....0..2..2

..0..0..2....0..2..2....1..1..1....0..2..2....0..0..1....0..0..0....0..2..2

CROSSREFS

Sequence in context: A232029 A268977 A224358 * A016771 A059979 A224315

Adjacent sequences:  A224014 A224015 A224016 * A224018 A224019 A224020

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 30 2013

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 20 06:37 EDT 2022. Contains 353852 sequences. (Running on oeis4.)