A236635 Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the upper median plus the minimum of every 2X2 subblock

81, 474, 2796, 16588, 98368, 582304, 3448740, 20433016, 121047396, 716976816, 4246991476, 25158285744, 149029929508, 882785392368, 5229257584788, 30976260240096, 183491943495380, 1086934090832432, 6438575430083476

Offset

1,1

Comments

Column 1 of A236640

Links

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

Formula

Empirical: a(n) = 50*a(n-3) +505*a(n-4) +1446*a(n-5) +4968*a(n-6) +9904*a(n-7) +2968*a(n-8) -14344*a(n-9) -107140*a(n-10) -262208*a(n-11) -282860*a(n-12) -257912*a(n-13) +344240*a(n-14) +1446208*a(n-15) +1594752*a(n-16) +1353472*a(n-17) +397312*a(n-18) -1295360*a(n-19) -1280000*a(n-20) -319488*a(n-21)

Example

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

Crossrefs

Sequence in context: A236640 A236780 A237678 * A236775 A205293 A205286

Adjacent sequences: A236632 A236633 A236634 * A236636 A236637 A236638

Keyword

nonn

Author

R. H. Hardin, Jan 29 2014

Status

approved