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

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

Offset

1,1

Comments

Diagonal of A242549

Links

R. H. Hardin, Table of n, a(n) for n = 1..132

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

Sequence in context: A245128 A121333 A243026 * A046725 A232331 A231992

Adjacent sequences: A242539 A242540 A242541 * A242543 A242544 A242545

Keyword

nonn

Author

R. H. Hardin, May 17 2014

Status

approved