%I #8 Feb 11 2016 08:02:11
%S 2,5,12,28,65,150,346,795,1826,4192,9621,22078,50660,116239,266704,
%T 611930,1404013,3221358,7391048,16957921,38908004,89269924,204819503,
%U 469934590,1078210352,2473828397,5675911794,13022719964
%N a(n) = 2*a(n-1) + a(n-2) - a(n-4) - a(n-5) - a(n-6) - a(n-7).
%D R. K. Guy, personal communication.
%H <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (2,1,0,-1,-1,-1,-1).
%F G.f.: ( -(x-1)*(x^4+2*x^3+3*x^2+3*x+2) ) / ( 1-2*x-x^2+x^4+x^5+x^6+x^7 ). - _R. J. Mathar_, Feb 11 2016
%Y Matches A018914 up to n<=6.
%K nonn,easy
%O 0,1
%A _N. J. A. Sloane_.