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!)
A185474 Number of (n+2) X 8 0..2 arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order. 1
169052, 1433903, 8297059, 37961900, 146203201, 493061605, 1497314456, 4179700035, 10893560939, 26828743607, 63022511852, 142244535949, 310251195820, 656871055669, 1354738985131, 2729104397743, 5381326476837 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 6 of A185477.
LINKS
FORMULA
Empirical: a(n) = (1/212666259456000)*n^19
+ (67/83147710464000)*n^18
+ (12559/194011324416000)*n^17
+ (12833/3923023104000)*n^16
+ (333169/2853107712000)*n^15
+ (196437919/62768369664000)*n^14
+ (1153058911/17118646272000)*n^13
+ (1339332949/1034643456000)*n^12
+ (28852162981/1207084032000)*n^11
+ (350922659539/877879296000)*n^10
+ (4735468557467/877879296000)*n^9
+ (11975048873639/219469824000)*n^8
+ (131882024236729/329204736000)*n^7
+ (7064899018536199/3362591232000)*n^6
+ (1862906706349061/237758976000)*n^5
+ (13955757767803297/653837184000)*n^4
+ (26671169520943/623750400)*n^3
+ (851721864110749/15437822400)*n^2
+ (4258571767339/116396280)*n
+ 2793.
EXAMPLE
Some solutions for 4 X 8
..0..0..0..0..0..0..0..1....0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..2
..0..0..0..0..0..0..1..1....0..0..0..0..1..1..2..2....0..0..0..0..0..0..2..2
..0..0..0..0..0..1..0..2....0..0..0..2..1..2..1..2....0..0..0..0..0..1..0..1
..0..0..0..0..2..1..2..1....0..0..0..2..1..2..2..0....0..0..1..1..1..2..1..1
CROSSREFS
Cf. A185477.
Sequence in context: A151618 A156426 A156427 * A034211 A308635 A210152
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 28 2011
STATUS
approved

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 June 20 02:43 EDT 2024. Contains 373512 sequences. (Running on oeis4.)