

A242542


Number of length n+3 0..n arrays with no four elements in a row with pattern aabb (possibly a=b) and new values 0..n introduced in 0..n order


1



6, 32, 150, 690, 3311, 16968, 93103, 544920, 3386262, 22243902, 153850981, 1116625523, 8478969009, 67185160511, 554235206898, 4750165417926, 42219358673456, 388485398829204, 3695187060252009, 36282147267628868
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OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

Some solutions for n=4
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....0....1....0....1....1....1....1....1....1....1....1....1....1....1....1
..2....1....0....1....0....2....2....2....1....2....2....1....1....0....1....2
..0....2....2....2....2....0....2....1....0....1....0....2....1....2....0....1
..1....2....2....1....0....3....1....0....2....3....2....1....0....1....1....2
..0....1....1....3....3....1....3....2....1....3....3....1....1....0....0....1
..3....2....0....2....0....3....4....3....3....2....2....2....1....0....2....3


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



