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 A274067 Number of n X 3 0..2 arrays with no three equal values forming an isosceles triangle, and new values introduced in 0..2 order. 1
 5, 50, 136, 111, 97, 235, 197, 389, 305, 589, 447, 823, 621, 1089, 827, 1387, 1065, 1717, 1335, 2079, 1637, 2473, 1971, 2899, 2337, 3357, 2735, 3847, 3165, 4369, 3627, 4923, 4121, 5509, 4647, 6127, 5205, 6777, 5795, 7459, 6417, 8173, 7071, 8919, 7757, 9697 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..65 FORMULA Empirical: a(n) = a(n-1) + 2*a(n-2) - 2*a(n-3) - a(n-4) + a(n-5) for n>13. Empirical g.f.: x*(5 + 45*x + 76*x^2 - 115*x^3 - 181*x^4 + 233*x^5 + 76*x^6 - 109*x^7 - 22*x^8 + 38*x^9 - 12*x^10 - 2*x^12) / ((1 - x)^3*(1 + x)^2). - Colin Barker, Jan 30 2019 EXAMPLE Some solutions for n=3: ..0..0..1. .0..0..0. .0..1..1. .0..1..1. .0..1..2. .0..1..1. .0..1..2 ..2..1..0. .1..2..2. .2..0..2. .2..0..2. .2..0..2. .0..2..2. .0..1..2 ..2..1..0. .2..1..1. .2..0..2. .2..1..0. .2..1..0. .2..1..1. .1..2..0 CROSSREFS Column 3 of A274068. Sequence in context: A136919 A136920 A358686 * A069540 A366678 A267640 Adjacent sequences: A274064 A274065 A274066 * A274068 A274069 A274070 KEYWORD nonn AUTHOR R. H. Hardin, Jun 09 2016 STATUS approved

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Last modified August 12 02:53 EDT 2024. Contains 375082 sequences. (Running on oeis4.)