A236597 Number of (n+1)X(1+1) 0..3 arrays colored with the maximum plus the upper median of every 2X2 subblock

256, 2596, 25950, 256376, 2525698, 24922062, 246386369, 2433171504, 24010605844, 237040427808, 2341100151528, 23116276195064, 228210652127196, 2253179860569112, 22248307411651820, 219673641163137064

Offset

1,1

Comments

Column 1 of A236601

Links

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

Formula

Empirical: a(n) = 224*a(n-3) +4264*a(n-4) +18336*a(n-5) +94100*a(n-6) +288576*a(n-7) -458324*a(n-8) -2955288*a(n-9) -9895792*a(n-10) -31179344*a(n-11) -22508592*a(n-12) +8785408*a(n-13) +23968768*a(n-14) +101248896*a(n-15) +87015168*a(n-16) -13844480*a(n-17) -14419968*a(n-18) -26182656*a(n-19) -23973888*a(n-20) for n>22

Example

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

Crossrefs

Sequence in context: A188842 A188705 A236601 * A235779 A235559 A235556

Adjacent sequences: A236594 A236595 A236596 * A236598 A236599 A236600

Keyword

nonn

Author

R. H. Hardin, Jan 29 2014

Status

approved