A183848 Number of (n+1)X4 0..3 arrays with each element of every 2X2 subblock being the sum mod 4 of two others

328, 1766, 9557, 54724, 310856, 1846987, 10793131, 65461226, 388802189, 2384144524, 14297712925, 88196069895, 532232190325, 3294387009947, 19971273401620, 123891049069844, 753824181622246, 4683860177500797

Offset

1,1

Comments

Column 3 of A183854

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=8*a(n-1)+59*a(n-2)-565*a(n-3)-822*a(n-4)+13359*a(n-5)-4545*a(n-6)-132397*a(n-7)+154942*a(n-8)+558160*a(n-9)-920421*a(n-10)-1048403*a(n-11)+2303548*a(n-12)+729071*a(n-13)-2730029*a(n-14)+118317*a(n-15)+1498861*a(n-16)-308470*a(n-17)-342440*a(n-18)+95112*a(n-19)+25872*a(n-20)-8064*a(n-21)

Example

Some solutions for 3X4
..3..1..1..3....2..0..2..2....1..3..1..3....2..2..0..2....1..2..1..3
..2..3..2..1....2..2..2..0....1..2..1..2....0..2..0..2....3..3..3..2
..3..1..3..3....0..0..2..0....3..3..3..3....2..2..2..2....1..2..1..1

Crossrefs

Sequence in context: A097738 A239536 A237505 * A205251 A138078 A232140

Adjacent sequences: A183845 A183846 A183847 * A183849 A183850 A183851

Keyword

nonn

Author

R. H. Hardin Jan 07 2011

Status

approved