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A185903 T(n,k)=1/8 the number of nXk 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 4
0, 1, 1, 1, 15, 1, 8, 196, 196, 8, 15, 2765, 7854, 2765, 15, 71, 38731, 546280, 546280, 38731, 71, 176, 545328, 28967421, 139230658, 28967421, 545328, 176, 673, 7675381, 1748982326, 32611077940, 32611077940, 1748982326, 7675381, 673, 1905 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Table starts

....0.........1...........1.............8.............15............71

....1........15.........196..........2765..........38731........545328

....1.......196........7854........546280.......28967421....1748982326

....8......2765......546280.....139230658....32611077940.7921723799549

...15.....38731....28967421...32611077940.30884279980274

...71....545328..1748982326.7921723799549

..176...7675381.98953708266

..673.108065699

.1905

LINKS

Table of n, a(n) for n=1..37.

EXAMPLE

Some solutions for 4X3 with a(1,1)=0

..0..4..5....0..0..4....0..4..0....0..0..6....0..4..2....0..4..6....0..0..3

..0..4..5....4..4..4....0..4..0....4..4..6....0..4..2....0..4..6....4..0..3

..1..1..4....6..7..3....6..6..0....4..4..5....5..3..3....2..0..0....4..0..0

..1..1..4....6..7..3....5..5..0....3..3..5....5..5..5....2..5..5....4..4..4

CROSSREFS

Column 1 is A015442(n-1)

Sequence in context: A040234 A040235 A040236 * A040237 A317835 A225762

Adjacent sequences:  A185900 A185901 A185902 * A185904 A185905 A185906

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Feb 06 2011

STATUS

approved

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Last modified March 21 22:19 EDT 2019. Contains 321382 sequences. (Running on oeis4.)