A237012 Number of (n+1)X(5+1) 0..3 arrays with the sum of all four elements of every 2X2 subblock equal

18496, 30248, 53200, 108824, 235456, 566936, 1419088, 3823352, 10606336, 31051928, 93101200, 291198584, 929945536, 3075627416, 10363357648, 35959849592, 126791656576, 457860358808, 1674516989200, 6238192077944

Offset

1,1

Comments

Column 5 of A237015

Links

R. H. Hardin, Table of n, a(n) for n = 1..68

Formula

Empirical: a(n) = 8*a(n-1) +16*a(n-2) -268*a(n-3) +189*a(n-4) +3388*a(n-5) -5824*a(n-6) -20048*a(n-7) +49756*a(n-8) +52752*a(n-9) -196896*a(n-10) -24192*a(n-11) +369216*a(n-12) -131328*a(n-13) -262656*a(n-14) +165888*a(n-15)

Example

Some solutions for n=4
..1..2..0..1..1..2....1..2..1..2..2..1....1..3..1..1..0..2....1..3..1..1..1..2
..0..1..1..2..0..1....1..1..1..1..0..2....2..1..2..3..3..2....2..1..2..3..2..2
..1..2..0..1..1..2....1..2..1..2..2..1....2..2..2..0..1..1....1..3..1..1..1..2
..0..1..1..2..0..1....2..0..2..0..1..1....2..1..2..3..3..2....2..1..2..3..2..2
..1..2..0..1..1..2....2..1..2..1..3..0....2..2..2..0..1..1....2..2..2..0..2..1

Crossrefs

Sequence in context: A157738 A247205 A173274 * A031817 A236816 A229076

Adjacent sequences: A237009 A237010 A237011 * A237013 A237014 A237015

Keyword

nonn

Author

R. H. Hardin, Feb 02 2014

Status

approved