A220319 T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..2 nXk array

1, 1, 1, 2, 5, 2, 4, 24, 24, 4, 7, 89, 353, 89, 7, 12, 389, 3167, 3167, 389, 12, 21, 1566, 28215, 56819, 28215, 1566, 21, 37, 6401, 237144, 984087, 984087, 237144, 6401, 37, 65, 25704, 1944692, 16290350

Offset

1,4

Comments

Table starts

..1....1......2......4......7.......12......21....37.65

..1....5.....24.....89....389.....1566....6401.25704

..2...24....353...3167..28215...237144.1944692

..4...89...3167..56819.984087.16290350

..7..389..28215.984087

.12.1566.237144

.21.6401

.37

Links

Table of n, a(n) for n=1..40.

Example

Some solutions for n=3 k=4
..0..1..0..0....0..0..0..0....0..0..0..0....0..0..0..1....0..0..1..1
..0..0..0..1....1..1..0..1....1..1..0..1....0..0..0..0....0..0..0..0
..0..1..0..1....1..1..0..1....0..0..0..0....1..0..0..0....1..0..1..0

Crossrefs

Column 1 is A005251(n+1)

Sequence in context: A122581 A151871 A220247 * A220342 A221676 A073054

Adjacent sequences: A220316 A220317 A220318 * A220320 A220321 A220322

Keyword

nonn,tabl

Author

R. H. Hardin Dec 10 2012

Status

approved