A236037 Number of (n+1)X(1+1) 0..3 arrays colored with the difference of the upper median and the lower median in each 2X2 subblock

256, 2404, 22994, 218568, 2089160, 19942272, 190367530, 1816294128, 17335318922, 165440670368, 1578998735732, 15069102332776, 143817863303654, 1372548635240096, 13099384602990930, 125016639614921288

Offset

1,1

Comments

Column 1 of A236041

Links

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

Formula

Empirical: a(n) = 28*a(n-2) +174*a(n-3) +2550*a(n-4) +8646*a(n-5) +41209*a(n-6) +132326*a(n-7) +160996*a(n-8) +471512*a(n-9) -257088*a(n-10) -2520320*a(n-11) -1767936*a(n-12) -8040704*a(n-13) -14097408*a(n-14) -5087232*a(n-15) -10715136*a(n-16) -11796480*a(n-17)

Example

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

Crossrefs

Sequence in context: A236083 A016780 A236041 * A251120 A251114 A205181

Adjacent sequences: A236034 A236035 A236036 * A236038 A236039 A236040

Keyword

nonn

Author

R. H. Hardin, Jan 18 2014

Status

approved