OFFSET

1,1

COMMENTS

If we consider a(1) = 11 to be a binary number and recursively construct a(n) by filling the space between neighboring bits in a(n-1) with their binary sum we obtain the binary sequence 11, 1101, 11011011, 110110111011011011101, .... This sequence converges to the Sturmian word A080764. - Peter Bala, Jan 30 2015

EXAMPLE

a(2) = 121; for a(3), in 1-2-1 the two (-) are replaced by 1+2 = 3 hence a(3)=13231.

CROSSREFS

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Jul 29 2005

EXTENSIONS

More terms from Maire O'Neill (mbo5001(AT)psu.edu), Oct 04 2005

STATUS

approved