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A224707
Number of different patterns using tiles from 1*1 to 1*n with each tile flush or diagonal to at least one other.
0
OFFSET
0,3
COMMENTS
Similar to A214366, but we can also have:
xxx xxxo
oo + o
+
etc...
EXAMPLE
The 3 cases for n=2 are:
oo+ oo oo
+ +
CROSSREFS
Cf. A214366.
Sequence in context: A195632 A152504 A191958 * A288922 A035331 A050819
KEYWORD
nonn
AUTHOR
Jon Perry, Apr 16 2013
STATUS
approved