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!)
A187140 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces 9
0, 171, 171, 405, 1773, 405, 3249, 19062, 19062, 3249, 12609, 182214, 267840, 182214, 12609, 72225, 1853892, 5755698, 5755698, 1853892, 72225, 332937, 18740754, 99203418, 201302208, 99203418, 18740754, 332937, 1731321, 189091422 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Table starts

........0..........171.............405..............3249..............12609

......171.........1773...........19062............182214............1853892

......405........19062..........267840...........5755698...........99203418

.....3249.......182214.........5755698.........201302208.........7020258336

....12609......1853892........99203418........7020258336.......440941355208

....72225.....18740754......1921749372......245891941002.....29716252404984

...332937....189091422.....34994620836.....8616423081600...1928394629936928

..1731321...1908891288....658156407930...301728175130790.127632346709629266

..8410473..19278208206..12168728064540.10570455159698376

.42400017.194645680218.227006548039242

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..84

EXAMPLE

Some solutions for 5X4

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

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

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

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

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

CROSSREFS

Column 1 is A185837

Sequence in context: A292090 A186871 A185614 * A185845 A045149 A031511

Adjacent sequences:  A187137 A187138 A187139 * A187141 A187142 A187143

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Mar 05 2011

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 27 23:26 EDT 2020. Contains 338047 sequences. (Running on oeis4.)