A206236 Number of (n+1)X7 0..3 arrays with every 2X3 or 3X2 subblock having exactly two equal edges, and new values 0..3 introduced in row major order

51066, 170728, 607008, 9042600, 118573968, 1448239080, 22535636736, 303011941944, 3712941210144, 57939122017416, 779043702707184, 9545971851249384, 148961482706745696, 2002921359660139224

Offset

1,1

Comments

Column 6 of A206238

Links

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

Formula

Empirical: a(n) = a(n-1) +2571*a(n-3) -2571*a(n-4) for n>10

Example

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

Crossrefs

Sequence in context: A237222 A178283 A252207 * A233901 A076710 A203405

Adjacent sequences: A206233 A206234 A206235 * A206237 A206238 A206239

Keyword

nonn

Author

R. H. Hardin Feb 05 2012

Status

approved