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A242577 Number of length n+3 0..n arrays with no four elements in a row with pattern aabb (with a!=b) and new values 0..n introduced in 0..n order 1
7, 35, 159, 723, 3453, 17634, 96472, 563256, 3492837, 22901243, 158134009, 1145995500, 8690227115, 68774540753, 566710394107, 4852093593696, 43084515133226, 396100229113680, 3764573877643410, 36935721134238873 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A242584

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..146

EXAMPLE

Some solutions for n=4

..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

..0....0....1....0....1....1....1....1....0....0....1....1....1....1....1....0

..1....1....2....0....2....2....0....1....0....1....2....2....2....2....0....1

..0....2....2....0....3....3....2....0....0....2....2....3....2....1....2....2

..0....0....0....1....0....1....0....1....0....3....3....1....3....2....3....3

..0....1....3....2....3....4....0....2....1....2....1....1....1....3....1....4

..1....3....3....3....0....2....0....1....2....3....4....4....0....2....0....4

CROSSREFS

Sequence in context: A265612 A005003 A243382 * A163348 A291237 A037099

Adjacent sequences:  A242574 A242575 A242576 * A242578 A242579 A242580

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 17 2014

STATUS

approved

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Last modified April 12 18:58 EDT 2021. Contains 342932 sequences. (Running on oeis4.)