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 A251253 Number of (n+1) X (3+1) 0..1 arrays with every 2 X 2 subblock having a single 1 or two 1s on the same edge. 1
 38, 150, 464, 1770, 5680, 21088, 69270, 252226, 842160, 3024532, 10215894, 36333498, 123729784, 437028516, 1496890470, 5261453226, 18095303560, 63384222948, 218626027574, 763932706666, 2640392321080, 9210217141124 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = a(n-1) + 13*a(n-2) - 7*a(n-3) - 32*a(n-4) + 8*a(n-5) + 10*a(n-6). Empirical g.f.: 2*x*(19 + 56*x - 90*x^2 - 189*x^3 + 72*x^4 + 71*x^5) / (1 - x - 13*x^2 + 7*x^3 + 32*x^4 - 8*x^5 - 10*x^6). - Colin Barker, Nov 27 2018 EXAMPLE Some solutions for n=4: ..1..1..0..1....1..1..1..0....1..1..1..1....0..0..0..1....0..0..0..0 ..0..0..0..0....0..0..0..0....0..0..0..0....0..1..0..1....1..1..0..1 ..1..0..1..0....0..1..1..1....0..1..1..1....0..0..0..0....0..0..0..0 ..0..0..0..0....0..0..0..0....0..0..0..0....0..1..0..1....1..0..1..0 ..1..1..0..1....0..1..0..1....1..1..1..0....0..0..0..0....1..0..1..0 CROSSREFS Column 3 of A251258. Sequence in context: A320309 A164093 A158064 * A224739 A135176 A318625 Adjacent sequences: A251250 A251251 A251252 * A251254 A251255 A251256 KEYWORD nonn AUTHOR R. H. Hardin, Dec 01 2014 STATUS approved

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Last modified August 11 23:09 EDT 2024. Contains 375079 sequences. (Running on oeis4.)