A235729 Number of (n+1) X (n+1) 0..1 arrays with the sum of each 2 X 2 subblock maximum and minimum lexicographically nondecreasing columnwise and nonincreasing rowwise.

16, 380, 29130, 7041734, 5507798734, 13917264768542, 113955406504401666, 3023114826732726577928, 259940094904908807764719054

Offset

1,1

Comments

Diagonal of A235736.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A235736.

Sequence in context: A333581 A201617 A235672 * A189766 A235442 A343213

Adjacent sequences: A235726 A235727 A235728 * A235730 A235731 A235732

Keyword

nonn

Author

R. H. Hardin, Jan 15 2014

Status

approved