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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A235304 Number of (n+1)X(2+1) 0..5 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant stress 1X1 tilings) 1
210, 518, 1106, 2918, 6786, 18662, 46226, 130598, 338370, 973478, 2602706, 7582118, 20721666, 60895142, 169042706, 499829798, 1403453250, 4167788198, 11804391506, 35162436518, 100271311746, 299327750822, 858333411986, 2566154588198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235310

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +25*a(n-2) -112*a(n-3) -231*a(n-4) +1260*a(n-5) +875*a(n-6) -7280*a(n-7) -224*a(n-8) +22736*a(n-9) -7980*a(n-10) -36288*a(n-11) +21456*a(n-12) +23040*a(n-13) -17280*a(n-14)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A147571 A306508 A254466 * A121479 A235921 A236432

Adjacent sequences:  A235301 A235302 A235303 * A235305 A235306 A235307

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 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 April 19 22:22 EDT 2019. Contains 322291 sequences. (Running on oeis4.)