A251330 Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock summing to 2 4 or 6

753, 7393, 75391, 801579, 8863633, 101497397, 1196729319, 14442382927, 177420001949, 2208479081653, 27755064033131, 351209824628763, 4465808638298741, 56979652386854697, 728758207069222935

Offset

1,1

Comments

Column 3 of A251335

Links

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

Formula

Empirical: a(n) = 49*a(n-1) -940*a(n-2) +8509*a(n-3) -30084*a(n-4) -47347*a(n-5) +500152*a(n-6) +81043*a(n-7) -3272883*a(n-8) -3063686*a(n-9) +3924236*a(n-10) +5794584*a(n-11) +519392*a(n-12) -1443456*a(n-13) -207360*a(n-14) +110592*a(n-15)

Example

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

Crossrefs

Sequence in context: A223447 A200211 A177423 * A092449 A197107 A274235

Adjacent sequences: A251327 A251328 A251329 * A251331 A251332 A251333

Keyword

nonn

Author

R. H. Hardin, Dec 01 2014

Status

approved