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

7, 35, 159, 723, 3453, 17634, 96472, 563256, 3492837, 22901243, 158134009, 1145995500, 8690227115, 68774540753, 566710394107, 4852093593696, 43084515133226, 396100229113680, 3764573877643410, 36935721134238873

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