A233718 Number of (n+1)X(1+1) 0..7 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 26

280, 1820, 11016, 68828, 423220, 2624872, 16201200, 100277820, 619644916, 3832773404, 23693063108, 146517647480, 905857050536, 5601325392044, 34632490183556, 214141349297724, 1324043851903528, 8186789590614456

Offset

1,1

Comments

Column 1 of A233724

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +58*a(n-2) -58*a(n-3) -1227*a(n-4) +461*a(n-5) +12296*a(n-6) +722*a(n-7) -62278*a(n-8) -22804*a(n-9) +155159*a(n-10) +90798*a(n-11) -162636*a(n-12) -121112*a(n-13) +35968*a(n-14) +28416*a(n-15) -1152*a(n-16)

Example

Some solutions for n=4
..5..6....6..7....3..4....3..0....5..5....4..4....0..4....1..3....1..4....2..2
..5..2....3..7....7..4....5..2....6..2....3..7....1..1....3..6....3..1....3..6
..5..1....6..6....4..6....5..1....5..2....6..6....5..4....3..7....6..3....2..6
..4..1....2..5....1..4....5..2....3..0....2..5....1..4....3..6....4..1....3..6
..2..4....5..3....4..6....6..6....3..4....5..7....5..4....5..3....5..1....1..3

Crossrefs

Sequence in context: A234905 A187178 A233724 * A272982 A234458 A234452

Adjacent sequences: A233715 A233716 A233717 * A233719 A233720 A233721

Keyword

nonn

Author

R. H. Hardin, Dec 15 2013

Status

approved