%N Expansion of 3*x*(1-x)*(1+2*x+6*x^2)/(1-24*x^3).
%C Previous name was: 3 people at a party are saying Hello to each other. Person 3 says Hello Hello Hello. Person 1 counts the times Hello has been said and says Hello that number of times. Person 2 says Hello a number of times equal to 2 * the sum of Hello's; then it is Person 3's turn again. Sequence gives the number of Hello's said.
%H <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,24).
%F G.f.: 3*x*(1-x)*(1+2*x+6*x^2)/(1-24*x^3). [_Colin Barker_, Jun 07 2012]
%Y Cf. A076510.
%A _Jon Perry_, Oct 15 2002