A204612 Number of (n+1)X5 0..1 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards

335, 3254, 31805, 313597, 3084029, 30487865, 301345617, 2981578169, 29501363457, 291960102793, 2889450045585, 28597252441945, 283033092812769, 2801263337159849, 27725017659322033, 274404110881625849

Offset

1,1

Comments

Column 4 of A204616

Links

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

Formula

Empirical: a(n) = 18*a(n-1) -73*a(n-2) -256*a(n-3) +2060*a(n-4) -1216*a(n-5) -12612*a(n-6) +18224*a(n-7) +20992*a(n-8) -40064*a(n-9) -9984*a(n-10) +24576*a(n-11) for n>15

Example

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

Crossrefs

Sequence in context: A224533 A253346 A253353 * A204796 A348822 A137522

Adjacent sequences: A204609 A204610 A204611 * A204613 A204614 A204615

Keyword

nonn

Author

R. H. Hardin Jan 17 2012

Status

approved