OFFSET
1,2
FORMULA
How many knights with move vector (2, 1, 0) are needed to occupy or attack every field of a k X m X n board? Knights may attack each other.
EXAMPLE
Cone starts:
1..2....3......4........5............6.................
...4.8..4.8....4.8......4.8..........4..6
........4.6.6..4.6.6....4.6.6........4..7..6
...............4.6.7.8..4.6.7..8.....4..8..8.12
........................5.6.8.10.13..6..8.10.12.?
.....................................8.11.12..?....
CROSSREFS
KEYWORD
hard,nonn,tabf
AUTHOR
Nikolaus Meyberg (Nikolaus.Meyberg(AT)t-online.de), Jul 17 2005
STATUS
approved