A237939 Number of (n+1)X(2+1) 0..2 arrays with the maximum minus the minimum of every 2X2 subblock equal

437, 5519, 70435, 946063, 12909207, 178348911, 2478121687, 34547541807, 482441897847, 6743242294207, 94297236738151, 1318980922040111, 18451660550452439, 258144363280637727, 3611650688217168775

Offset

1,1

Comments

Column 2 of A237945

Links

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

Formula

Empirical: a(n) = 20*a(n-1) -56*a(n-2) -524*a(n-3) +1719*a(n-4) +2496*a(n-5) -12490*a(n-6) +8016*a(n-7) +10172*a(n-8) -11936*a(n-9) +1560*a(n-10) +1344*a(n-11) -320*a(n-12)

Example

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

Crossrefs

Sequence in context: A216988 A190828 A084293 * A088893 A043447 A006911

Adjacent sequences: A237936 A237937 A237938 * A237940 A237941 A237942

Keyword

nonn

Author

R. H. Hardin, Feb 16 2014

Status

approved