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A249999 Expansion of 1/((1-x)^2*(1-2*x)*(1-3*x)). 1

%I

%S 1,7,32,122,423,1389,4414,13744,42245,128771,390396,1179366,3554467,

%T 10696153,32153978,96592988,290041089,870647535,2612991160,7841070610,

%U 23527406111,70590606917,211788597942,635399348232,1906265153533,5718929678299,17157057470324,51471709281854

%N Expansion of 1/((1-x)^2*(1-2*x)*(1-3*x)).

%H <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (7,-17,17,-6).

%F a(n) = 9/4 - 2^(n+3) + n/2 + 3^(n+3)/4. - _R. J. Mathar_, Jan 09 2015

%Y Cf. A000392 (first differences), A094705, A243869, A249997.

%K nonn,easy

%O 0,2

%A _Alex Ratushnyak_, Dec 28 2014

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Last modified July 28 19:33 EDT 2021. Contains 346335 sequences. (Running on oeis4.)