A222158 Number of nX6 arrays with each row a permutation of 1..6 having at least as many downsteps as the preceding row, with rows in lexicographically nondecreasing order

720, 215659, 38778082, 4900249687, 474541614240, 37174156067106, 2443652727700740, 138390122328018723, 6886742682955869488, 305784165735033471729, 12263159054342175847892, 448624205061282686849788

Offset

1,1

Comments

Column 6 of A222159

Links

R. H. Hardin, Table of n, a(n) for n = 1..209

Example

Some solutions for n=3
..1..2..4..6..3..5....1..4..5..6..3..2....1..2..3..5..4..6....1..2..4..3..5..6
..1..3..5..6..4..2....1..5..4..3..2..6....1..2..4..5..3..6....1..3..4..6..5..2
..1..4..6..3..2..5....1..6..4..3..5..2....1..2..6..5..4..3....1..6..3..2..5..4

Crossrefs

Sequence in context: A221436 A239184 A003439 * A145093 A221621 A054779

Adjacent sequences: A222155 A222156 A222157 * A222159 A222160 A222161

Keyword

nonn

Author

R. H. Hardin Feb 10 2013

Status

approved