A238175 Number of (n+1)X(3+1) 0..2 arrays with the maximum plus the minimum of every 2X2 subblock equal

2329, 69023, 2027833, 62220767, 1917124097, 59356544695, 1839517772097, 57041499462367, 1769077034861049, 54869963289748751, 1701895480615144705, 52788019393696146951, 1637341717839368325985, 50785983421267344740815

Offset

1,1

Comments

Column 3 of A238180

Links

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

Formula

Empirical: a(n) = 49*a(n-1) -545*a(n-2) -1988*a(n-3) +54954*a(n-4) -146726*a(n-5) -976002*a(n-6) +4971928*a(n-7) -1809493*a(n-8) -23027443*a(n-9) +29412787*a(n-10) +29650212*a(n-11) -62209316*a(n-12) -2721808*a(n-13) +42539968*a(n-14) -8853248*a(n-15) -8996864*a(n-16) +2113536*a(n-17)

Example

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

Crossrefs

Sequence in context: A232107 A186058 A309672 * A203344 A178552 A166581

Adjacent sequences: A238172 A238173 A238174 * A238176 A238177 A238178

Keyword

nonn

Author

R. H. Hardin, Feb 19 2014

Status

approved