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!)
A224394 Number of 5Xn 0..3 arrays with diagonals and antidiagonals unimodal and rows nondecreasing 1
1024, 100000, 1268572, 8573507, 45648753, 211856287, 882833522, 3343528551, 11604617405, 37199618077, 110964317169, 310166468938, 817551602005, 2043560704475, 4868244723248, 11101332102787, 24326305539913 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A224391

LINKS

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

FORMULA

Empirical: a(n) = (769/444787200)*n^15 + (348923/10897286400)*n^14 + (1834741/3113510400)*n^13 + (1653961/239500800)*n^12 + (15881209/239500800)*n^11 + (3185767/4354560)*n^10 + (6331231/21772800)*n^9 + (8051546371/152409600)*n^8 - (92949613/680400)*n^7 + (29776075747/21772800)*n^6 - (235108166129/119750400)*n^5 + (1142919607439/59875200)*n^4 - (2395878032771/43243200)*n^3 + (4577919285997/37837800)*n^2 - (3999067013/10010)*n + 824171 for n>7

EXAMPLE

Some solutions for n=3

..0..0..0....0..0..2....0..0..2....0..0..2....0..0..2....0..2..2....0..2..2

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

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

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

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

CROSSREFS

Sequence in context: A236216 A264002 A016961 * A224027 A174155 A269205

Adjacent sequences:  A224391 A224392 A224393 * A224395 A224396 A224397

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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 25 08:55 EST 2022. Contains 350565 sequences. (Running on oeis4.)