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!)
A235183 Number of (n+1)X(5+1) 0..5 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 5, with no adjacent elements equal (constant stress tilted 1X1 tilings) 1
4656, 9780, 19952, 45128, 99096, 236376, 545768, 1351904, 3234336, 8236464, 20235512, 52632200, 132063816, 349337952, 892241120, 2393564720, 6209733240, 16862423016, 44373812264, 121811965088, 324794526624, 900449967888 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A235186

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +41*a(n-2) -177*a(n-3) -709*a(n-4) +3405*a(n-5) +6658*a(n-6) -37423*a(n-7) -35857*a(n-8) +259792*a(n-9) +100713*a(n-10) -1189883*a(n-11) -44519*a(n-12) +3652705*a(n-13) -650588*a(n-14) -7506845*a(n-15) +2237158*a(n-16) +10206566*a(n-17) -3478912*a(n-18) -9024208*a(n-19) +2879248*a(n-20) +5075680*a(n-21) -1279200*a(n-22) -1728912*a(n-23) +283680*a(n-24) +319968*a(n-25) -24192*a(n-26) -24192*a(n-27)

EXAMPLE

Some solutions for n=4

..4..3..4..2..5..2....3..1..3..0..3..2....5..3..5..2..5..1....4..0..4..0..3..0

..1..5..1..4..2..4....1..4..1..3..1..5....1..4..1..3..1..2....1..2..1..2..0..2

..4..3..4..2..5..2....3..1..3..0..3..2....4..2..4..1..4..0....4..0..4..0..3..0

..0..4..0..3..1..3....0..3..0..2..0..4....2..5..2..4..2..3....3..4..3..4..2..4

..4..3..4..2..5..2....4..2..4..1..4..3....4..2..4..1..4..0....5..1..5..1..4..1

CROSSREFS

Sequence in context: A122713 A235235 A118815 * A069646 A159220 A020422

Adjacent sequences:  A235180 A235181 A235182 * A235184 A235185 A235186

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 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 July 26 16:44 EDT 2021. Contains 346294 sequences. (Running on oeis4.)