A237152 Number of (n+1)X(2+1) 0..3 arrays with the maximum plus the minimum of every 2X2 subblock equal

1868, 37652, 762508, 16547988, 367558796, 8327731884, 190715003652, 4398267676604, 101855057140548, 2364789226002900, 54988238070630044, 1279827071158817828, 29804114720736509244, 694301197214817879804

Offset

1,1

Comments

Column 2 of A237158

Links

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

Formula

Empirical: a(n) = 55*a(n-1) -1035*a(n-2) +6857*a(n-3) +16166*a(n-4) -418194*a(n-5) +1564374*a(n-6) +1495550*a(n-7) -20565065*a(n-8) +35087663*a(n-9) +12182197*a(n-10) -64353607*a(n-11) +12508772*a(n-12) +36204908*a(n-13) -9872064*a(n-14) -5608640*a(n-15) +1752064*a(n-16)

Example

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

Crossrefs

Sequence in context: A054816 A052168 A354444 * A306864 A306877 A073495

Adjacent sequences: A237149 A237150 A237151 * A237153 A237154 A237155

Keyword

nonn

Author

R. H. Hardin, Feb 04 2014

Status

approved