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!)
A224393 Number of 4Xn 0..3 arrays with diagonals and antidiagonals unimodal and rows nondecreasing 1
256, 10000, 86701, 497958, 2332222, 9331553, 32806574, 103452812, 297410156, 789731500, 1957606141, 4569537752, 10116846904, 21372349639, 43300242010, 84493906854, 159387825448, 291579791772, 518714491591, 899524090772 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A224391

LINKS

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

FORMULA

Empirical: a(n) = (3551/47900160)*n^12 + (17561/13305600)*n^11 + (410317/21772800)*n^10 + (127787/725760)*n^9 + (394837/290304)*n^8 + (4724393/1209600)*n^7 + (880093831/21772800)*n^6 - (673403/80640)*n^5 + (476636641/1088640)*n^4 + (58121267/907200)*n^3 - (1924453/415800)*n^2 - (1998055/2772)*n + 1906 for n>4

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A191680 A191496 A016960 * A224026 A237966 A205936

Adjacent sequences: A224390 A224391 A224392 * A224394 A224395 A224396

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 05 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 February 6 16:43 EST 2023. Contains 360110 sequences. (Running on oeis4.)