A210007 Number of (n+1)X4 0..2 arrays containing all values 0..2 with every 2X2 subblock having two or three distinct values, and new values 0..2 introduced in row major order

893, 70923, 5258039, 385841179, 28267925909, 2070471867089, 151644743405597, 11106638825609387, 813462442022950735, 59578874503149148763, 4363621497207730378229, 319596378000027147845681

Offset

1,1

Comments

Column 3 of A210012

Links

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

Formula

Empirical: a(n) = 75*a(n-1) -30*a(n-2) -7001*a(n-3) -18089*a(n-4) +52126*a(n-5) +91400*a(n-6) -118464*a(n-7) -92992*a(n-8) +85632*a(n-9) -13824*a(n-10)

Example

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

Crossrefs

Sequence in context: A309871 A063878 A063167 * A251315 A218814 A264329

Adjacent sequences: A210004 A210005 A210006 * A210008 A210009 A210010

Keyword

nonn

Author

R. H. Hardin Mar 16 2012

Status

approved