A205624 Number of (n+1)X7 0..2 arrays with every 2X2 subblock in a row having an equal number of equal diagonal or equal antidiagonal elements, adjacent rows differing in this number, and new values 0..2 introduced in row major order

12290, 235464, 5439324, 122380932, 2832970656, 63787803360, 1476599815224, 33256412762112, 769675322520768, 17338707086415744, 401193884234815488, 9039770660342553600, 209123017753154075136, 4712999137787533074432

Offset

1,1

Comments

Column 6 of A205626

Links

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

Formula

Empirical: a(n) = 520*a(n-2) +112*a(n-3) -1344*a(n-4) -8832*a(n-5) -71232*a(n-6) -36864*a(n-7) -1408000*a(n-8) -9338880*a(n-10) -66060288*a(n-12) for n>13

Example

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

Crossrefs

Sequence in context: A133860 A133861 A133862 * A205359 A061745 A251776

Adjacent sequences: A205621 A205622 A205623 * A205625 A205626 A205627

Keyword

nonn

Author

R. H. Hardin Jan 29 2012

Status

approved