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!)
A237688 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median plus the minimum minus the lower median of every 2X2 subblock equal 1
256, 1120, 5038, 23838, 115028, 567446, 2840760, 14437142, 74266834, 386657722, 2033497964, 10798721926, 57813989720, 311880302990, 1693057951386, 9243577235114, 50703873592100, 279292256979166, 1543652306971720 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A237694

LINKS

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

FORMULA

Empirical: a(n) = 14*a(n-1) +20*a(n-2) -1082*a(n-3) +2362*a(n-4) +34354*a(n-5) -131705*a(n-6) -579568*a(n-7) +3141610*a(n-8) +5491396*a(n-9) -44175192*a(n-10) -25301792*a(n-11) +406929824*a(n-12) -23847968*a(n-13) -2583700832*a(n-14) +1097030464*a(n-15) +11623922816*a(n-16) -7374042624*a(n-17) -37617469696*a(n-18) +27740250624*a(n-19) +88149855232*a(n-20) -66895181824*a(n-21) -149456072704*a(n-22) +106833551360*a(n-23) +181681192960*a(n-24) -112708681728*a(n-25) -155197308928*a(n-26) +76541722624*a(n-27) +89870041088*a(n-28) -31670665216*a(n-29) -33125564416*a(n-30) +7132413952*a(n-31) +6895435776*a(n-32) -654311424*a(n-33) -603979776*a(n-34)

EXAMPLE

Some solutions for n=5

..2..3....0..2....3..0....0..2....2..3....0..0....2..0....0..3....2..2....0..2

..0..2....0..2....2..2....1..3....0..3....3..1....1..3....2..1....3..2....3..3

..1..0....1..3....1..0....1..1....2..1....3..3....0..2....2..1....3..1....3..1

..2..2....0..2....3..1....1..3....0..3....1..3....2..0....3..0....3..0....0..2

..3..0....3..1....0..1....0..0....1..0....2..0....1..3....3..2....1..3....2..0

..2..2....2..0....1..3....2..2....2..3....0..2....0..0....2..1....0..3....3..1

CROSSREFS

Sequence in context: A237218 A237212 A237694 * A237299 A237293 A206118

Adjacent sequences:  A237685 A237686 A237687 * A237689 A237690 A237691

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 11 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 August 5 06:46 EDT 2020. Contains 336209 sequences. (Running on oeis4.)