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!)
A219383 Number of 3Xn arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and columns, 0..2 3Xn array 1
10, 23, 84, 315, 957, 2792, 7472, 18910, 45821, 106497, 238299, 515292, 1080657, 2205286, 4390769, 8547511, 16297421, 30480517, 55990723, 101135570, 179818410, 314994970, 544079375, 927296441, 1560435245, 2594104692, 4262492403 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A219381

LINKS

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

FORMULA

Empirical: a(n) = (1/20922789888000)*n^16 - (1/237758976000)*n^15 + (269/1046139494400)*n^14 - (61/7472424960)*n^13 + (1943/16422912000)*n^12 + (21517/7185024000)*n^11 - (1297279/7315660800)*n^10 + (266365/73156608)*n^9 - (3097589969/146313216000)*n^8 - (1214098793/2612736000)*n^7 + (8357493713/821145600)*n^6 - (827698471/13063680)*n^5 - (92069549514517/435891456000)*n^4 + (89775326103539/18162144000)*n^3 - (14226973583203/605404800)*n^2 + (20337873821/720720)*n + 39675 for n>16

EXAMPLE

Some solutions for n=3

..0..1..0....0..0..1....1..1..2....1..1..2....1..1..1....1..1..1....0..0..0

..0..0..0....1..0..0....1..1..2....2..1..2....1..1..1....1..1..1....0..0..0

..0..2..0....2..0..1....1..1..2....2..2..2....2..2..2....1..1..2....2..0..1

CROSSREFS

Sequence in context: A164578 A219472 A196890 * A250188 A177126 A300150

Adjacent sequences:  A219380 A219381 A219382 * A219384 A219385 A219386

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 19 2012

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 September 25 04:45 EDT 2021. Contains 347652 sequences. (Running on oeis4.)