A204305 Number of (n+1)X4 0..3 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards

22500, 1077978, 47834122, 1271789125, 32895567670, 592113170884, 10499120334579, 142632804549589, 1918455248089606, 21064909995711116, 229630271367702047, 2135133737142157099, 19745487705327645774

Offset

1,1

Comments

Column 3 of A204309

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..1..3..2..3....3..3..1..3....1..1..3..2....0..0..1..1....1..0..2..1
..1..0..0..1....0..1..2..3....2..3..1..3....1..3..3..3....0..3..3..3
..1..3..2..3....3..3..2..2....0..3..2..3....2..0..1..2....3..3..2..3
..2..3..1..3....0..2..2..3....2..3..3..3....1..3..3..3....0..3..3..3
..1..3..2..3....3..3..2..2....1..2..3..3....0..2..1..2....3..3..2..3

Crossrefs

Sequence in context: A237215 A230924 A250441 * A251116 A235415 A235260

Adjacent sequences: A204302 A204303 A204304 * A204306 A204307 A204308

Keyword

nonn

Author

R. H. Hardin Jan 14 2012

Status

approved