A235759 Number of (n+1)X(2+1) 0..1 arrays with the sum of each 2X2 subblock two median terms lexicographically nondecreasing columnwise and nonincreasing rowwise

48, 216, 977, 3900, 15197, 55816, 199720, 691634, 2344746, 7785110, 25435107, 81902482, 260560751, 820159066, 2558049098, 7914489044, 24315115380, 74237856204, 225414249637, 681094975856, 2048957867649, 6139801922404

Offset

1,1

Comments

Column 2 of A235765

Links

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

Formula

Empirical: a(n) = 10*a(n-1) -29*a(n-2) -20*a(n-3) +230*a(n-4) -196*a(n-5) -646*a(n-6) +984*a(n-7) +839*a(n-8) -1926*a(n-9) -429*a(n-10) +1916*a(n-11) -108*a(n-12) -960*a(n-13) +208*a(n-14) +192*a(n-15) -64*a(n-16)

Example

Some solutions for n=4
..1..0..1....1..0..1....1..0..1....1..1..1....0..1..1....1..0..1....1..1..1
..1..0..1....0..0..0....0..1..1....1..1..1....1..0..1....1..0..1....0..1..0
..0..0..0....0..0..0....0..1..0....1..0..1....0..1..1....1..0..1....0..1..0
..0..0..1....0..0..0....0..0..1....0..1..0....1..0..1....0..0..0....0..1..0
..0..0..0....0..0..1....0..0..0....0..0..1....1..0..0....0..0..0....1..0..1

Crossrefs

Sequence in context: A260240 A260062 A364922 * A062248 A100146 A235542

Adjacent sequences: A235756 A235757 A235758 * A235760 A235761 A235762

Keyword

nonn

Author

R. H. Hardin, Jan 15 2014

Status

approved