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 A183999 Number of (n+1) X 6 0..2 arrays with all 2 X 2 subblock sums the same. 1
 2025, 2691, 3793, 6111, 10449, 19935, 39697, 85431, 190305, 450111, 1098433, 2812551, 7386129, 20098095, 55623217, 157619511, 451006785, 1309524831, 3821415073, 11250418791, 33202564209, 98511527055, 292616203537 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 5 of A184003. LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 FORMULA Empirical: a(n) = 6*a(n-1) - 60*a(n-3) + 85*a(n-4) + 150*a(n-5) - 360*a(n-6) + 396*a(n-8) - 216*a(n-9). Empirical g.f.: x*(2025 - 9459*x - 12353*x^2 + 104853*x^3 - 36882*x^4 - 347664*x^5 + 289692*x^6 + 354564*x^7 - 367416*x^8) / ((1 - x)*(1 - 2*x)*(1 - 3*x)*(1 - 2*x^2)*(1 - 3*x^2)*(1 - 6*x^2)). - Colin Barker, Apr 09 2018 EXAMPLE Some solutions for 3 X 6: ..2..0..1..1..1..0....0..1..0..1..0..1....0..2..2..1..0..1....0..2..0..1..1..2 ..0..2..1..1..1..2....2..2..2..2..2..2....2..1..0..2..2..2....2..1..2..2..1..1 ..2..0..1..1..1..0....1..0..1..0..1..0....0..2..2..1..0..1....1..1..1..0..2..1 CROSSREFS Cf. A184003. Sequence in context: A156855 A306870 A126172 * A360216 A250811 A350869 Adjacent sequences: A183996 A183997 A183998 * A184000 A184001 A184002 KEYWORD nonn AUTHOR R. H. Hardin, Jan 08 2011 STATUS approved

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Last modified March 29 19:01 EDT 2023. Contains 361599 sequences. (Running on oeis4.)