A236665 Number of (n+1)X(2+1) 0..2 arrays colored with the maximum plus the lower median minus the upper median minus the minimum of every 2X2 subblock

452, 3720, 30352, 250708, 2079296, 17174856, 141244420, 1164128912, 9621726624, 79482813380, 655231830400, 5401567597688, 44585646697668, 368127909661952, 3037143174811536, 25048761635649892, 206675846777470992

Offset

1,1

Comments

Column 2 of A236669

Links

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

Formula

Empirical: a(n) = 2*a(n-2) +65*a(n-3) +2268*a(n-4) +9820*a(n-5) +28192*a(n-6) +67800*a(n-7) -62168*a(n-8) -623456*a(n-9) -512512*a(n-10) +1674752*a(n-11) +5791232*a(n-12) +13304832*a(n-13) +17710080*a(n-14) +8847360*a(n-15)

Example

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

Crossrefs

Sequence in context: A183636 A222823 A205209 * A318627 A206217 A233228

Adjacent sequences: A236662 A236663 A236664 * A236666 A236667 A236668

Keyword

nonn

Author

R. H. Hardin, Jan 29 2014

Status

approved