A233974 Number of (n+1)X(1+1) 0..6 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 13

216, 1308, 7920, 50680, 323296, 2103216, 13644992, 89161440, 581609344, 3804770496, 24864267008, 162703454080, 1063953804800, 6962647313152, 45541030759424, 298031207468544, 1949526857414656, 12758209633799168

Offset

1,1

Comments

Column 1 of A233980

Links

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

Formula

Empirical: a(n) = 78*a(n-2) -1896*a(n-4) +18176*a(n-6) -65792*a(n-8) +67072*a(n-10)

Example

Some solutions for n=4
..1..0....4..0....3..6....2..1....0..0....3..6....3..4....4..6....0..1....3..4
..0..4....4..3....4..2....0..4....4..1....4..2....2..6....3..2....0..4....0..4
..1..2....4..0....0..1....2..1....5..3....5..6....4..3....0..4....3..2....1..2
..4..0....3..2....2..4....1..5....1..4....4..2....0..4....0..1....4..0....5..1
..1..0....0..4....5..6....1..2....0..0....0..1....3..4....4..0....2..1....2..3

Crossrefs

Sequence in context: A233853 A245993 A233980 * A016863 A033698 A121683

Adjacent sequences: A233971 A233972 A233973 * A233975 A233976 A233977

Keyword

nonn

Author

R. H. Hardin, Dec 18 2013

Status

approved