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A196636 T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,3,2,0,4 for x=0,1,2,3,4 8
1, 1, 1, 1, 2, 1, 1, 5, 5, 1, 1, 10, 21, 10, 1, 1, 26, 62, 62, 26, 1, 1, 65, 232, 327, 232, 65, 1, 1, 161, 780, 1927, 1927, 780, 161, 1, 1, 403, 2716, 10708, 17278, 10708, 2716, 403, 1, 1, 1006, 9427, 61040, 152925, 152925, 61040, 9427, 1006, 1, 1, 2511, 32612, 344949 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Every 0 is next to 0 1's, every 1 is next to 1 3's, every 2 is next to 2 2's, every 3 is next to 3 0's, every 4 is next to 4 4's

Table starts

.1....1......1........1.........1...........1.............1...............1

.1....2......5.......10........26..........65...........161.............403

.1....5.....21.......62.......232.........780..........2716............9427

.1...10.....62......327......1927.......10708.........61040..........344949

.1...26....232.....1927.....17278......152925.......1339251........11820065

.1...65....780....10708....152925.....2140040......29718190.......415475619

.1..161...2716....61040...1339251....29718190.....651323279.....14313363492

.1..403...9427...344949..11820065...415475619...14313363492....497248017421

.1.1006..32612..1953280.103936104..5791281872..314536084653..17247507478680

.1.2511.113008.11058838.915486074.80883758124.6918341058099.598955597283389

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..220

EXAMPLE

Some solutions for n=6 k=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A197217 A197242 A128564 * A196641 A197090 A008518

Adjacent sequences:  A196633 A196634 A196635 * A196637 A196638 A196639

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Oct 04 2011

STATUS

approved

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Last modified September 24 15:33 EDT 2021. Contains 347643 sequences. (Running on oeis4.)