%I

%S 0,0,0,0,0,0,0,1,1,2,2,3,4,4,5,6,7,8,9,10,11,13,14,15,17,18,20,21,23,

%T 25,27,29,31,33,35,37,39,41,43,46,48,51,53,56,59,61,64,67,70,73,76,79,

%U 82,86,89,92,96,99,103,106,110,114,118,122,126,130,134,138,142,146,150

%N [ n(n-1)/32 ].

%F G.f.: x^7(1+x^2-x^3+x^4+x^9+x^14+x^19-x^20+x^21+x^23)/((1-x)(1-x^3)(1-x^32));

%o (PARI) a(n)=if(n<0,0,(n^2-n)\32)

%K nonn

%O 0,10

%A _N. J. A. Sloane_.