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!)
A223636 Number of nX7 0..1 arrays with rows, antidiagonals and columns unimodal 1

%I #4 Mar 24 2013 10:48:35

%S 29,841,12657,114713,748950,3907140,17224974,66448428,229624238,

%T 723456027,2106393383,5727793388,14669871333,35633091730,82556882471,

%U 183320486518,391738700030,808400385799,1615892668057,3136875572418

%N Number of nX7 0..1 arrays with rows, antidiagonals and columns unimodal

%C Column 7 of A223637

%H R. H. Hardin, <a href="/A223636/b223636.txt">Table of n, a(n) for n = 1..201</a>

%F Empirical: a(n) = (503/209563200)*n^14 - (76217/778377600)*n^13 + (88483/23950080)*n^12 - (1160261/17107200)*n^11 + (158917/435456)*n^10 + (88785757/3628800)*n^9 - (2720678887/3048192)*n^8 + (182706654569/10886400)*n^7 - (2182833462133/10886400)*n^6 + (2369225181061/1555200)*n^5 - (18729229340021/2993760)*n^4 + (2512793025389/9979200)*n^3 + (795324348531341/5821200)*n^2 - (56828168983661/90090)*n + 981755694 for n>12

%e Some solutions for n=4

%e ..0..1..1..1..0..0..0....0..0..0..0..0..0..0....0..0..0..1..0..0..0

%e ..1..1..1..1..1..1..0....1..0..0..0..0..0..0....0..0..1..1..1..1..0

%e ..1..0..0..0..0..0..0....0..0..1..1..1..0..0....0..0..1..1..1..0..0

%e ..0..0..0..0..0..0..0....0..0..1..1..0..0..0....0..0..0..0..1..0..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 24 2013

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified September 1 05:33 EDT 2024. Contains 375575 sequences. (Running on oeis4.)