A233639 Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 2

324, 3004, 26192, 238570, 2118568, 19123682, 170872144, 1536664586, 13763062452, 123586823454, 1107950019012, 9942988603154, 89172232214800, 800059336063782, 7176304451952648, 64380100876459694, 577506337320638840

Offset

1,1

Comments

Column 3 of A233644

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +76*a(n-2) -5*a(n-3) -1165*a(n-4) +564*a(n-5) +5703*a(n-6) -4723*a(n-7) -9217*a(n-8) +10950*a(n-9) +1714*a(n-10) -5684*a(n-11) +1880*a(n-12) -96*a(n-13)

Example

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

Crossrefs

Sequence in context: A229538 A250437 A064197 * A203374 A183358 A128381

Adjacent sequences: A233636 A233637 A233638 * A233640 A233641 A233642

Keyword

nonn

Author

R. H. Hardin, Dec 14 2013

Status

approved