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A204612 Number of (n+1)X5 0..1 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards 1
335, 3254, 31805, 313597, 3084029, 30487865, 301345617, 2981578169, 29501363457, 291960102793, 2889450045585, 28597252441945, 283033092812769, 2801263337159849, 27725017659322033, 274404110881625849 (list; graph; refs; listen; history; text; internal format)
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 A137522 A090487

Adjacent sequences:  A204609 A204610 A204611 * A204613 A204614 A204615

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 17 2012

STATUS

approved

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Last modified June 18 18:09 EDT 2021. Contains 345120 sequences. (Running on oeis4.)