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!)
A235759 Number of (n+1)X(2+1) 0..1 arrays with the sum of each 2X2 subblock two median terms lexicographically nondecreasing columnwise and nonincreasing rowwise 1
48, 216, 977, 3900, 15197, 55816, 199720, 691634, 2344746, 7785110, 25435107, 81902482, 260560751, 820159066, 2558049098, 7914489044, 24315115380, 74237856204, 225414249637, 681094975856, 2048957867649, 6139801922404 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235765

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) -29*a(n-2) -20*a(n-3) +230*a(n-4) -196*a(n-5) -646*a(n-6) +984*a(n-7) +839*a(n-8) -1926*a(n-9) -429*a(n-10) +1916*a(n-11) -108*a(n-12) -960*a(n-13) +208*a(n-14) +192*a(n-15) -64*a(n-16)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A183683 A260240 A260062 * A062248 A100146 A235542

Adjacent sequences:  A235756 A235757 A235758 * A235760 A235761 A235762

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 15 2014

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 16 06:14 EDT 2021. Contains 348040 sequences. (Running on oeis4.)