

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
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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



