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!)
A235277 Number of (n+1)X(7+1) 0..4 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant stress 1X1 tilings) 1
6208, 8012, 10088, 14672, 20440, 33464, 51800, 93992, 160888, 317192, 593048, 1246472, 2502520, 5518664, 11691800, 26719112, 58853368, 138080072, 312608408, 747636872, 1725115000, 4182997064, 9778136600, 23940964232, 56457574648 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A235280

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +15*a(n-2) -15*a(n-3) -80*a(n-4) +80*a(n-5) +180*a(n-6) -180*a(n-7) -144*a(n-8) +144*a(n-9)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A186602 A031836 A094494 * A246889 A172629 A172697

Adjacent sequences:  A235274 A235275 A235276 * A235278 A235279 A235280

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 June 2 11:35 EDT 2020. Contains 334771 sequences. (Running on oeis4.)