A237891 - OEIS

A237891

Number of (n+1)X(1+1) 0..3 arrays with the maximum minus the upper median of every 2X2 subblock equal

256, 1848, 13600, 103536, 789664, 6082368, 46779520, 361265248, 2786083392, 21532089984, 166271212672, 1285560189056, 9935602175744, 76850629138688, 594353896659968, 4599265959516672, 35591445248337920, 275542319637241856

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OFFSET

1,1

COMMENTS

Column 1 of A237898

LINKS

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

FORMULA

Empirical: a(n) = 16*a(n-1) -1056*a(n-3) +3004*a(n-4) +23416*a(n-5) -88096*a(n-6) -240560*a(n-7) +1022032*a(n-8) +1305632*a(n-9) -5841664*a(n-10) -4008768*a(n-11) +17716928*a(n-12) +6995840*a(n-13) -28273408*a(n-14) -6652672*a(n-15) +21161472*a(n-16) +3426816*a(n-17) -4948992*a(n-18) -1188864*a(n-19)

EXAMPLE

Some solutions for n=4

..1..3....3..2....2..1....2..2....3..2....2..3....1..0....0..2....2..3....0..2

..2..0....2..2....2..1....0..0....0..1....3..2....2..3....3..2....3..0....2..0

..1..3....3..2....2..0....3..3....0..0....1..3....2..0....1..2....3..3....3..3

..2..0....0..2....2..2....1..2....3..2....0..3....0..3....1..1....3..3....1..1

..3..0....0..3....1..0....1..2....2..1....3..1....2..2....2..3....2..2....1..1

CROSSREFS

Sequence in context: A238298 A238293 A237898 * A237158 A237151 A237574

Adjacent sequences: A237888 A237889 A237890 * A237892 A237893 A237894

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 15 2014

STATUS

approved