A186789 Half the number of (n+2)X4 binary arrays with each 3X3 subblock having a sum in 2..7

1910, 29020, 440505, 6687805, 101532811, 1541462868, 23402344941, 355292192013, 5394012633636, 81891392695720, 1243267423038501, 18875169103575908, 286561042384512461, 4350542798392582750, 66049531656898579770

Offset

1,1

Comments

Column 2 of A186796

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=13*a(n-1)+27*a(n-2)+97*a(n-3)-13*a(n-4)-696*a(n-5)-487*a(n-6)+531*a(n-7)+1379*a(n-8)+420*a(n-9)-720*a(n-10)-888*a(n-11)-72*a(n-12)+216*a(n-13)+216*a(n-14)

Example

Some solutions for 6X4 with a(1,1)=0
..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0
..0..0..0..1....0..0..1..0....0..0..1..0....0..0..0..1....0..0..0..1
..1..1..1..1....1..0..1..1....0..0..1..1....1..0..1..1....1..1..0..0
..0..1..1..0....0..1..1..0....0..1..1..0....0..0..1..0....1..0..1..0
..1..1..0..1....0..1..1..0....0..0..1..1....1..1..1..0....0..1..1..1
..1..0..0..1....1..0..1..0....0..0..1..1....0..1..0..1....0..0..1..1

Crossrefs

Sequence in context: A184194 A209551 A238059 * A229390 A072274 A168499

Adjacent sequences: A186786 A186787 A186788 * A186790 A186791 A186792

Keyword

nonn

Author

R. H. Hardin Feb 26 2011

Status

approved