A237069 Number of (n+1)X(1+1) 0..3 arrays with the upper median of every 2X2 subblock equal

256, 2132, 15882, 128988, 1042300, 8613338, 71747464, 604396964, 5132149170, 43910139636, 378007127116, 3271425891026, 28436225035504, 248077289597684, 2170686359190426, 19040036742791820, 167340548970850396

Offset

1,1

Comments

Column 1 of A237076

Links

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

Formula

Empirical: a(n) = 20*a(n-1) -80*a(n-2) -614*a(n-3) +3996*a(n-4) +6360*a(n-5) -60341*a(n-6) -25592*a(n-7) +404984*a(n-8) +30176*a(n-9) -1229712*a(n-10) +1327104*a(n-12)

Example

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

Crossrefs

Sequence in context: A205466 A205459 A237076 * A346961 A206063 A206056

Adjacent sequences: A237066 A237067 A237068 * A237070 A237071 A237072

Keyword

nonn

Author

R. H. Hardin, Feb 03 2014

Status

approved