A210008 Number of (n+1)X5 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

8217, 1808865, 385841179, 82060746485, 17447565687601, 3709556186877991, 788692753629890373, 167684774000295868135, 35651630563687273774303, 7579929460620522393582529, 1611576517115404819603119985

Offset

1,1

Comments

Column 4 of A210012

Links

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

Formula

Empirical: a(n) = 218*a(n-1) -672*a(n-2) -102513*a(n-3) +336965*a(n-4) +9441327*a(n-5) -64650448*a(n-6) +29276745*a(n-7) +733248704*a(n-8) -1733314135*a(n-9) -814273096*a(n-10) +6961302814*a(n-11) -7307156292*a(n-12) -92994368*a(n-13) +3740262880*a(n-14) -1180127616*a(n-15) -466935296*a(n-16) +173254656*a(n-17) +18587648*a(n-18) -5406720*a(n-19)

Example

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

Crossrefs

Sequence in context: A320285 A168471 A031844 * A168632 A230043 A045056

Adjacent sequences: A210005 A210006 A210007 * A210009 A210010 A210011

Keyword

nonn

Author

R. H. Hardin Mar 16 2012

Status

approved