A177558 Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, up, up.

1, 1, 6, 90, 2401, 101761, 6291216, 534649500, 59805912601, 8519381695801, 1505829663622626, 323403835613234310, 82950935886564603001, 25045332571083387933241, 8792814340394735774002236, 3551704765357254157594658520, 1635557840926288462033032891601

Offset

0,3

Links

Table of n, a(n) for n=0..16.

Mingjia Yang and Doron Zeilberger, Increasing Consecutive Patterns in Words, arXiv:1805.06077 [math.CO], 2018.

Mingjia Yang, An experimental walk in patterns, partitions, and words, Ph. D. Dissertation, Rutgers University (2020).

Crossrefs

Cf. A177564, A177574, A177594.

Sequence in context: A147630 A221097 A177584 * A177580 A177587 A177585

Adjacent sequences: A177555 A177556 A177557 * A177559 A177560 A177561

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Extensions

a(12)-a(15) from Alois P. Heinz, Nov 01 2013

a(0), a(16) from Alois P. Heinz, Aug 08 2018

Status

approved