Numerator of n*(n-3)*(3*n^2-6*n+2)/(3*(n-1)*(n-2)).

Terms

a(0) =0a(1) =52a(2) =235a(3) =111a(4) =1498a(5) =2920a(6) =1719a(7) =4235a(8) =13156a(9) =6516a(10) =28015a(11) =19481a(12) =17610a(13) =70096a(14) =91273a(15) =19485a(16) =147592a(17) =183940a(18) =75537a(19) =138149a(20) =333730a(21) =133224a(22) =474925a(23) =280163a(24) =218916a(25) =765100a(26) =886327a(27) =170235a(28) =1171366