OFFSET
1,1
COMMENTS
In the two digits {0,1} the corresponding sequence is 2,2,4,4,8,8,16,16,32,32,64,64,... which appears to be A060546.
FORMULA
It is conjectured that a(n)=(n+2)*2^((n-1) div 2).
EXAMPLE
The table of absolute differences of {2,1,1,0} is
2
1.1
1.0.1
0.1.1.0
with the diagonal of leading absolute differences again forming the word (2110).
Thus (2110) is one of the twelve words in the digits {0,1,2} that are counted in calculating a(4).
CROSSREFS
KEYWORD
nonn,more
AUTHOR
John W. Layman, Mar 23 2004
STATUS
approved