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!)
A250146 Number of length 7+2 0..n arrays with the medians of every three consecutive terms nondecreasing 1
180, 4530, 45232, 274901, 1219944, 4350588, 13201680, 35373129, 85849852, 192208302, 402420096, 796122925, 1500404816, 2711339928, 4722722400, 7963669329, 13047004740, 20830593418, 32494066704, 49633671813, 74378281912 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A250140

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..136

FORMULA

Empirical: a(n) = (169/3780)*n^9 + (1867/2520)*n^8 + (4241/840)*n^7 + (829/45)*n^6 + (7103/180)*n^5 + (18479/360)*n^4 + (305191/7560)*n^3 + (11659/630)*n^2 + (533/105)*n + 1

EXAMPLE

Some solutions for n=3

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

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A058835 A008432 A289318 * A243465 A271673 A008378

Adjacent sequences:  A250143 A250144 A250145 * A250147 A250148 A250149

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 13 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 October 16 19:46 EDT 2021. Contains 348044 sequences. (Running on oeis4.)