A278806 Number of n X 7 0..2 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order.

36, 1254, 69834, 6275546, 725674326, 89730161098, 10811999412826, 1224101415304069, 128795068372302728, 12581278164317910030, 1143931690129837256876, 97156838914464540981998

Offset

1,1

Comments

Column 7 of A278807.

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

Some solutions for n=3
..1..1..1..1..0..0..0. .2..1..1..0..0..0..0. .2..2..1..1..1..1..1
..2..1..0..0..1..1..1. .2..2..1..2..1..0..0. .2..2..2..1..1..0..0
..2..1..2..0..1..1..0. .2..2..2..1..1..2..1. .2..2..2..2..2..2..1

Crossrefs

Cf. A278807.

Sequence in context: A113938 A001110 A331234 * A064196 A060786 A270961

Adjacent sequences: A278803 A278804 A278805 * A278807 A278808 A278809

Keyword

nonn

Author

R. H. Hardin, Nov 28 2016

Status

approved