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 A185460 Number of (n+1) X 3 binary arrays with no 2 X 2 subblock determinant equal to any horizontal or vertical neighbor 2 X 2 subblock determinant. 1
 34, 92, 240, 672, 1646, 4452, 11050, 29506, 74092, 195978, 496142, 1303446, 3318830, 8676824, 22183736, 57796628, 148199862, 385159228, 989675770, 2567545726, 6607214940, 17119703570, 44102038206, 114168385010, 294332423078 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A185467. LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 FORMULA Empirical: a(n) = 5*a(n-2) + 4*a(n-3) + 4*a(n-4) - 8*a(n-5) - a(n-6) + 3*a(n-8) for n>10. Empirical g.f.: 2*x*(17 + 46*x + 35*x^2 + 38*x^3 - 29*x^4 + 18*x^5 - 29*x^6 - 7*x^7 - 18*x^8 + 2*x^9) / (1 - 5*x^2 - 4*x^3 - 4*x^4 + 8*x^5 + x^6 - 3*x^8). - Colin Barker, Apr 15 2018 EXAMPLE Some solutions for 5 X 3: ..1..1..0....1..1..1....1..1..0....1..1..1....0..1..0....0..1..0....0..0..1 ..0..1..0....0..1..0....0..1..0....0..1..0....1..1..1....0..1..1....0..1..0 ..1..0..1....1..1..1....1..0..1....1..1..0....0..1..1....1..1..1....1..0..1 ..0..1..1....0..1..0....0..1..0....1..1..1....0..1..0....1..1..0....1..1..0 ..0..0..1....1..0..1....0..0..1....1..0..0....1..0..0....1..0..0....0..0..1 CROSSREFS Cf. A185467. Sequence in context: A067977 A183311 A282811 * A260467 A202421 A202414 Adjacent sequences:  A185457 A185458 A185459 * A185461 A185462 A185463 KEYWORD nonn AUTHOR R. H. Hardin, Jan 28 2011 STATUS approved

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Last modified March 28 15:12 EDT 2020. Contains 333089 sequences. (Running on oeis4.)