A236712 Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the lower median of every 2X2 subblock

81, 398, 1940, 9608, 47952, 237952, 1181504, 5866176, 29136768, 144679680, 718521728, 3568103296, 17719157632, 87992364672, 436975643520, 2170012116096, 10776237000576, 53514684402816, 265754308813696, 1319733513668736

Offset

1,1

Comments

Column 1 of A236719

Links

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

Formula

Empirical: a(n) = 30*a(n-3) +269*a(n-4) +514*a(n-5) +1680*a(n-6) +2568*a(n-7) -364*a(n-8) +264*a(n-9) -19856*a(n-10) -31072*a(n-11) -40512*a(n-12) -74112*a(n-13) -34048*a(n-14) -33280*a(n-15) -20480*a(n-16)

Example

Some solutions for n=5
..1..1....0..2....0..0....2..1....2..1....1..0....2..2....1..0....2..1....1..0
..0..1....1..0....2..2....2..0....2..0....0..0....0..0....0..2....0..1....0..0
..2..1....0..1....2..1....2..0....0..1....2..2....1..0....2..2....0..1....2..2
..2..2....0..2....1..2....1..1....1..0....1..2....0..2....1..0....1..1....2..0
..1..0....2..2....2..2....1..1....1..1....0..0....1..1....2..0....2..0....1..1
..1..0....1..0....0..0....2..0....2..1....1..1....1..1....2..1....0..2....0..1

Crossrefs

Sequence in context: A236618 A236611 A236719 * A206542 A206535 A017498

Adjacent sequences: A236709 A236710 A236711 * A236713 A236714 A236715

Keyword

nonn

Author

R. H. Hardin, Jan 30 2014

Status

approved