A243026 Number of length n+3 0..n arrays with no four elements in a row with pattern abba (possibly a=b) and new values 0..n introduced in 0..n order

6, 32, 147, 672, 3223, 16516, 90634, 530734, 3300512, 21698553, 150209133, 1091147286, 8292645182, 65763764253, 542946198732, 4656991447441, 41421558322822, 381409654365465, 3630279289866355, 35667136335350080

Offset

1,1

Comments

Diagonal of A243033

Links

R. H. Hardin, Table of n, a(n) for n = 1..59

Example

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

Crossrefs

Sequence in context: A027217 A245128 A121333 * A242542 A046725 A232331

Adjacent sequences: A243023 A243024 A243025 * A243027 A243028 A243029

Keyword

nonn

Author

R. H. Hardin, May 29 2014

Status

approved