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%I #5 Dec 03 2012 17:15:15
%S 1,1,241,3895,151817,4134881,128938297,3814023955,115136505933,
%T 3448441154503,103598912114381,3108676107844557,93324146271938457,
%U 2801146229279170843,84082823432914559453,2523871643346500063787,75758559732310254661669,2274020749613202850958405
%N Number of tilings of a 6 X n rectangle using right trominoes and 1 X 1 tiles.
%H Alois P. Heinz, <a href="/A220056/b220056.txt">Table of n, a(n) for n = 0..300</a>
%F G.f. see Maple program.
%p gf:= -(128*x^27 -2784*x^26 +11984*x^25 -8672*x^24 -7128*x^23 -34144*x^22 -125640*x^21 +760596*x^20 -718466*x^19 -174758*x^18 +2760675*x^17 -10918043*x^16 +15110507*x^15 -1068879*x^14 -13774618*x^13 +9742272*x^12 +298116*x^11 -1535703*x^10 -168489*x^9 +78558*x^8 +130467*x^7 +2413*x^6 -18124*x^5 -3982*x^4 +368*x^3 +295*x^2 +12*x -1) /
%p (3072*x^30 -49664*x^29 -102080*x^28 +441952*x^27 +988592*x^26 -641184*x^25 -6795568*x^24 -3529824*x^23 +39110100*x^22 -11698064*x^21 -93989108*x^20 +89810738*x^19 +53775823*x^18 -80969102*x^17 -68370580*x^16 +104188994*x^15 +46195161*x^14 -118554222*x^13 +26901436*x^12 +45228345*x^11 -25090652*x^10 -4432537*x^9 +5299837*x^8 -37118*x^7 -530937*x^6 +10786*x^5 +29450*x^4 -607*x^3 -523*x^2 -13*x +1):
%p a:= n-> coeff (series (gf, x, n+1), x, n):
%p seq(a(n), n=0..30);
%Y Column k=6 of A220054.
%K nonn
%O 0,3
%A _Alois P. Heinz_, Dec 03 2012
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