A236944 Number of (n+1)X(3+1) 0..3 arrays with the maximum of every 2X2 subblock equal

30698, 4301002, 534626674, 73196854050, 9747614152466, 1323313139705714, 178570730290963762, 24188583189413610834, 3272297286434860436082, 443019425037292709391314, 59961874606271329410684850

Offset

1,1

Comments

Column 3 of A236949

Links

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

Formula

Empirical: a(n) = 120*a(n-1) +6357*a(n-2) -535534*a(n-3) -9438006*a(n-4) +451376496*a(n-5) +4848440936*a(n-6) -103326877056*a(n-7) -603997054080*a(n-8) +5225099461632*a(n-9) +18051212537856*a(n-10) -16735126487040*a(n-11) -31844444405760*a(n-12) +26005292974080*a(n-13)

Example

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

Crossrefs

Sequence in context: A235853 A237636 A236126 * A269828 A270057 A236899

Adjacent sequences: A236941 A236942 A236943 * A236945 A236946 A236947

Keyword

nonn

Author

R. H. Hardin, Feb 01 2014

Status

approved