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 A220055 Number of tilings of a 5 X n rectangle using right trominoes and 1 X 1 tiles. 2
 1, 1, 87, 849, 16839, 249651, 4134881, 65564239, 1057354073, 16939662301, 272086395449, 4365892578855, 70082433262847, 1124809701807527, 18054055051423891, 289774657566172859, 4651038841674376909, 74651407535212480809, 1198192596525147061411 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Alois P. Heinz, Table of n, a(n) for n = 0..300 FORMULA G.f.: see Maple program. MAPLE gf:= (20*x^12 +88*x^11 -162*x^10 +26*x^9 +506*x^8 +453*x^7 -605*x^6 -300*x^5 -12*x^4 +47*x^3 +63*x^2 +6*x -1) / (76*x^14 -152*x^13 -212*x^12 -64*x^11 +1180*x^10 -1738*x^9 -3069*x^8 +308*x^7 +5229*x^6 -756*x^5 -1701*x^4 +144*x^3 +143*x^2 +7*x -1): a:= n-> coeff (series (gf, x, n+1), x, n): seq(a(n), n=0..30); CROSSREFS Column k=5 of A220054. Sequence in context: A109601 A297723 A061625 * A281806 A128956 A283952 Adjacent sequences: A220052 A220053 A220054 * A220056 A220057 A220058 KEYWORD nonn AUTHOR Alois P. Heinz, Dec 03 2012 STATUS approved

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Last modified May 30 08:27 EDT 2023. Contains 363050 sequences. (Running on oeis4.)