login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A240785 Number of 4Xn 0..1 arrays with no element equal to fewer vertical neighbors than horizontal neighbors, with new values 0..1 introduced in row major order 1
8, 34, 97, 305, 959, 3033, 9581, 30354, 96122, 304551, 964960, 3057691, 9689250, 30704176, 97298863, 308333649, 977091497, 3096352093, 9812187127, 31094352992, 98536547134, 312257747281, 989530396718, 3135776321313, 9937131194560 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A240783

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -11*a(n-2) +7*a(n-3) -10*a(n-5) +13*a(n-6) -3*a(n-7) +27*a(n-8) -44*a(n-9) +13*a(n-10) +5*a(n-11) -8*a(n-12) +8*a(n-13) -3*a(n-14) +a(n-15)

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A298140 A301887 A208639 * A066804 A033455 A172202

Adjacent sequences:  A240782 A240783 A240784 * A240786 A240787 A240788

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 12 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 19 16:17 EDT 2019. Contains 328223 sequences. (Running on oeis4.)