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!)
A223722 Number of nX5 0..2 arrays with rows, antidiagonals and columns unimodal 1
86, 7396, 273562, 5537147, 74140718, 733129227, 5733691150, 37151436091, 206162721823, 1004293423046, 4376877826065, 17322507754495, 63011209241684, 212742488020655, 672145108969951, 2000883664124046, 5644951281387772 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A223725
LINKS
FORMULA
Empirical: a(n) = (63370093/405483668029440000)*n^20 + (332923627/121645100408832000)*n^19 + (35260507/365849926041600)*n^18 + (11581079/8208171417600)*n^17 + (1549596019/89669099520000)*n^16 + (13415418209/62768369664000)*n^15 + (11281922929/8369115955200)*n^14 + (42712449023/3766102179840)*n^13 + (170811516793/3762339840000)*n^12 + (464597326061/877879296000)*n^11 - (328969296617/78829977600)*n^10 + (13832782422227/241416806400)*n^9 - (125724812428752281/313841848320000)*n^8 + (25263722436660997/11769069312000)*n^7 - (2160123866746163/269007298560)*n^6 + (37001904714133/1676505600)*n^5 - (815520542725887227/15878903040000)*n^4 + (13936490795992651/102918816000)*n^3 - (17701274883426919/53330659200)*n^2 + (9337885696189/21162960)*n - 143729 for n>5
EXAMPLE
Some solutions for n=3
..0..0..0..0..0....0..2..2..2..2....0..1..1..2..1....0..2..2..2..1
..0..1..1..1..1....0..2..2..1..0....0..1..2..2..1....0..1..1..2..1
..0..2..0..0..0....1..2..1..1..0....0..1..2..2..2....1..1..1..2..1
CROSSREFS
Sequence in context: A266823 A262471 A223739 * A223828 A223786 A223972
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 26 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)