A220342 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..3 nXk array

1, 1, 1, 2, 5, 2, 4, 24, 24, 4, 7, 89, 355, 89, 7, 12, 389, 3281, 3281, 389, 12, 21, 1570, 28993, 60003, 28993, 1570, 21, 37, 6413, 242224, 1022813, 1022813, 242224, 6413, 37, 65, 25744, 1973258, 16673578

Offset

1,4

Comments

Table starts

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

..1....5.....24......89.....389.....1570....6413.25744

..2...24....355....3281...28993...242224.1973258

..4...89...3281...60003.1022813.16673578

..7..389..28993.1022813

.12.1570.242224

.21.6413

.37

Links

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

Example

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

Crossrefs

Column 1 is A005251(n+1)

Sequence in context: A151871 A220247 A220319 * A221676 A073054 A010695

Adjacent sequences: A220339 A220340 A220341 * A220343 A220344 A220345

Keyword

nonn,tabl

Author

R. H. Hardin Dec 11 2012

Status

approved