A210047 Number of (n+1)X4 0..2 arrays containing all values 0..2 with every 2X2 subblock having two distinct values, and new values 0..2 introduced in row major order

75, 1271, 20871, 332891, 5169813, 78792305, 1184416509, 17624469579, 260264902127, 3821147552379, 55850881366677, 813499248661201, 11816892350999277, 171285288093188555, 2478576674689280655

Offset

1,1

Comments

Column 3 of A210052

Links

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

Formula

Empirical: a(n) = 24*a(n-1) -89*a(n-2) -977*a(n-3) +3094*a(n-4) +13063*a(n-5) -28268*a(n-6) -71414*a(n-7) +90536*a(n-8) +163472*a(n-9) -114928*a(n-10) -148256*a(n-11) +54080*a(n-12) +35328*a(n-13) -9216*a(n-14)

Example

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

Crossrefs

Sequence in context: A218094 A285920 A293581 * A210505 A285856 A202257

Adjacent sequences: A210044 A210045 A210046 * A210048 A210049 A210050

Keyword

nonn

Author

R. H. Hardin Mar 16 2012

Status

approved