

A243382


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


1



7, 35, 158, 715, 3406, 17366, 94907, 553807, 3433490, 22512257, 155472029, 1126989053, 8548807676, 67679513141, 557899676487, 4778535406628, 42448208962613, 390404810629273, 3711893438414835, 36432789329793687
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,1


COMMENTS

Diagonal of A243389


LINKS

R. H. Hardin, Table of n, a(n) for n = 1..62


EXAMPLE

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


CROSSREFS

Sequence in context: A171477 A265612 A005003 * A242577 A163348 A291237
Adjacent sequences: A243379 A243380 A243381 * A243383 A243384 A243385


KEYWORD

nonn


AUTHOR

R. H. Hardin, Jun 04 2014


STATUS

approved



