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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A234450 T(n,k)=Number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 1 (constant stress 1X1 tilings) 7
160, 1120, 1120, 8064, 11574, 8064, 58720, 125080, 125080, 58720, 428800, 1377422, 2053280, 1377422, 428800, 3137920, 15269704, 34601928, 34601928, 15269704, 3137920, 22953984, 170001402, 588663528, 898985624, 588663528, 170001402 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

........160.........1120...........8064.............58720..............428800

.......1120........11574.........125080...........1377422............15269704

.......8064.......125080........2053280..........34601928...........588663528

......58720......1377422.......34601928.........898985624.........23647980136

.....428800.....15269704......588663528.......23647980136........963859893408

....3137920....170001402....10079824144......627437990794......39720806964788

...22953984...1894235272...172781443608....16674841633492....1639385463803776

..168075520..21145362278..2969800840496...444755926154674...67993371547921628

.1229731840.235980939816.51008286679168.11853880524355808.2815853396337809696

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..97

FORMULA

Empirical for column k:

k=1: a(n) = 60*a(n-2) -344*a(n-4)

k=2: [order 17]

k=3: [order 92]

EXAMPLE

Some solutions for n=2 k=4

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

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

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

CROSSREFS

Sequence in context: A234898 A234891 A305272 * A234444 A166778 A236518

Adjacent sequences:  A234447 A234448 A234449 * A234451 A234452 A234453

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Dec 26 2013

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 17 21:57 EDT 2019. Contains 328134 sequences. (Running on oeis4.)