login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A223641 Number of nX5 0..1 arrays with rows, columns, diagonals and antidiagonals unimodal 1
16, 256, 2014, 9808, 36947, 120307, 354726, 967582, 2469396, 5941152, 13555296, 29475566, 61346859, 122671803, 236477826, 440811016, 796753648, 1399853788, 2396080742, 4003682172, 6542620323, 10473608867, 16449161244, 25379498938 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A223644

LINKS

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

FORMULA

Empirical: a(n) = (359/453600)*n^10 - (391/18144)*n^9 + (27901/60480)*n^8 - (5318/945)*n^7 + (220373/5400)*n^6 + (42079/4320)*n^5 - (611182913/181440)*n^4 + (204761033/5670)*n^3 - (1618325179/8400)*n^2 + (680702213/1260)*n - 629380 for n>7

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A296779 A188994 A208075 * A223682 A189066 A189191

Adjacent sequences:  A223638 A223639 A223640 * A223642 A223643 A223644

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 December 6 00:51 EST 2021. Contains 349558 sequences. (Running on oeis4.)