A184226 Half the number of (n+1)X5 0..3 arrays with every 2X2 subblock diagonal sum differing from its antidiagonal sum by more than 3

621, 14641, 224156, 4207437, 72246797, 1292899174, 22718557269, 402560143085, 7106563915316, 125668351802785, 2220554387222673, 39250640995900250, 693688800303272397, 12260638522902016569, 216694437717450254826

Offset

1,1

Comments

Column 4 of A184231

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=17*a(n-1)+108*a(n-2)-1760*a(n-3)-1953*a(n-4)+58066*a(n-5)-35781*a(n-6)-761159*a(n-7)+923230*a(n-8)+4884844*a(n-9)-7337776*a(n-10)-16577262*a(n-11)+28574166*a(n-12)+29948774*a(n-13)-60427857*a(n-14)-27012303*a(n-15)+71527868*a(n-16)+9323166*a(n-17)-48297090*a(n-18)+2120251*a(n-19)+18623886*a(n-20)-2698012*a(n-21)-3945852*a(n-22)+813213*a(n-23)+409293*a(n-24)-99576*a(n-25)-14904*a(n-26)+3888*a(n-27)

Example

Some solutions for 3X5
..0..2..1..3..1....0..3..0..3..2....2..0..2..0..3....2..1..3..1..3
..2..0..3..0..3....3..0..2..0..3....1..3..1..3..0....0..3..0..3..1
..1..3..1..3..0....2..3..1..3..2....2..0..3..1..2....3..0..3..0..3

Crossrefs

Sequence in context: A189119 A203086 A251243 * A260764 A224432 A229318

Adjacent sequences: A184223 A184224 A184225 * A184227 A184228 A184229

Keyword

nonn

Author

R. H. Hardin Jan 10 2011

Status

approved