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!)
A223635 Number of nX6 0..1 arrays with rows, antidiagonals and columns unimodal 1
22, 484, 5699, 42109, 230619, 1026377, 3907140, 13135511, 39889555, 111242770, 288488044, 702553878, 1619299148, 3555008655, 7473337157, 15110365462, 29495673113, 55765989646, 102405932407, 183099750019, 319441371676 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A223637

LINKS

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

FORMULA

Empirical: a(n) = (271/5443200)*n^12 - (10327/9979200)*n^11 + (61997/2177280)*n^10 - (21923/80640)*n^9 + (417761/1814400)*n^8 + (37222841/604800)*n^7 - (2521405483/2177280)*n^6 + (8668581613/725760)*n^5 - (414044081579/5443200)*n^4 + (88564150211/302400)*n^3 - (17419930607/30240)*n^2 + (542846047/3080)*n + 850576 for n>8

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207744 A207721 A223737 * A223720 A223667 A223826

Adjacent sequences:  A223632 A223633 A223634 * A223636 A223637 A223638

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 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 October 17 13:32 EDT 2021. Contains 348049 sequences. (Running on oeis4.)