A177637 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up.

1, 1, 70, 20251, 19387201, 47213021620, 246331792085401, 2443003220126326201, 42187963284758541226270, 1186523552401322210323083451, 51563739785315001241213870794001, 3318691262415781291317711866423813020, 305473715050119138647351857854838738832401

Offset

0,3

Links

Table of n, a(n) for n=0..12.

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

Crossrefs

Sequence in context: A007099 A004109 A002829 * A145410 A177638 A274646

Adjacent sequences: A177634 A177635 A177636 * A177638 A177639 A177640

Keyword

nonn

Author

R. H. Hardin, May 10 2010

Extensions

a(8) from Alois P. Heinz, Oct 22 2013

a(0), a(9)-a(12) from Alois P. Heinz, Aug 08 2018

Status

approved