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!)
A224130 Number of n X 5 0..1 arrays with rows nondecreasing and antidiagonals unimodal. 1
6, 36, 175, 760, 3149, 12874, 52581, 215136, 881461, 3613806, 14818385, 60762820, 249150689, 1021591594, 4188791861, 17175102296, 70422257341, 288749179526, 1183945486745, 4854479873580, 19904611911929, 81614010974114 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A224133.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) - 9*a(n-2) + 4*a(n-3) + 2*a(n-4) + 8*a(n-5).

Empirical g.f.: x*(6 + 13*x^2 + 10*x^3 + 8*x^4) / (1 - 6*x + 9*x^2 - 4*x^3 - 2*x^4 - 8*x^5). - Colin Barker, Aug 27 2018

EXAMPLE

Some solutions for n=3:

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

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

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

CROSSREFS

Cf. A224133.

Sequence in context: A293886 A132165 A200573 * A283197 A218265 A258629

Adjacent sequences:  A224127 A224128 A224129 * A224131 A224132 A224133

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 31 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 25 09:51 EDT 2021. Contains 348239 sequences. (Running on oeis4.)