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!)
A249886 Number of length 3+6 0..n arrays with no seven consecutive terms having the maximum of any three terms equal to the minimum of the remaining four terms 1
35, 2335, 46460, 463880, 2967275, 13967995, 52655600, 167876760, 469717035, 1183918175, 2739855580, 5905755440, 11988148835, 23116240715, 42635915200, 75642505040, 129686222355, 215689279935, 349119227420, 551468884600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A249883

LINKS

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

FORMULA

Empirical: a(n) = n^9 + (9/7)*n^8 + (100/21)*n^7 + (20/3)*n^6 + (59/6)*n^5 + (91/12)*n^4 + (5/3)*n^3 + (55/28)*n^2 + (5/21)*n

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A094187 A202921 A215291 * A290584 A174749 A184124

Adjacent sequences:  A249883 A249884 A249885 * A249887 A249888 A249889

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 07 2014

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 27 16:20 EST 2022. Contains 350608 sequences. (Running on oeis4.)