A236004 Number of (n+1)X(2+1) 0..3 arrays with the minimum plus the maximum equal to the lower median plus the upper median in every 2X2 subblock

508, 4568, 41608, 389520, 3726296, 36383144, 361779592, 3655701448, 37454598528, 388247972432, 4063669727288, 42871361603912, 455195773077752, 4858023680834872, 52059161943692016, 559682634231909344

Offset

1,1

Comments

Column 2 of A236009

Links

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

Formula

Empirical: a(n) = 43*a(n-1) -763*a(n-2) +7147*a(n-3) -36573*a(n-4) +84065*a(n-5) +69894*a(n-6) -844584*a(n-7) +1395964*a(n-8) +1156720*a(n-9) -4996336*a(n-10) +928096*a(n-11) +6404480*a(n-12) -1078656*a(n-13) -4024832*a(n-14) -1081344*a(n-15) +79872*a(n-16) +32768*a(n-17)

Example

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

Crossrefs

Sequence in context: A035848 A028685 A152524 * A024019 A159686 A198195

Adjacent sequences: A236001 A236002 A236003 * A236005 A236006 A236007

Keyword

nonn

Author

R. H. Hardin, Jan 18 2014

Status

approved