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A237891 Number of (n+1)X(1+1) 0..3 arrays with the maximum minus the upper median of every 2X2 subblock equal 1
256, 1848, 13600, 103536, 789664, 6082368, 46779520, 361265248, 2786083392, 21532089984, 166271212672, 1285560189056, 9935602175744, 76850629138688, 594353896659968, 4599265959516672, 35591445248337920, 275542319637241856 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A237898
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 15 2014
STATUS
approved

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Last modified July 23 08:23 EDT 2024. Contains 374546 sequences. (Running on oeis4.)