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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 1
6, 32, 147, 672, 3223, 16516, 90634, 530734, 3300512, 21698553, 150209133, 1091147286, 8292645182, 65763764253, 542946198732, 4656991447441, 41421558322822, 381409654365465, 3630279289866355, 35667136335350080 (list; graph; refs; listen; history; text; internal format)
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

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Last modified November 28 18:39 EST 2021. Contains 349415 sequences. (Running on oeis4.)