a(n) = n*(n^2 + 3)*(n^6 + 6*n^4 + 9*n^2 + 3).

Terms

a(0) =0a(1) =76a(2) =2786a(3) =46764a(4) =439204a(5) =2744420a(6) =12813606a(7) =48229636a(8) =153992264a(9) =432083484a(10) =1092730090a(11) =2537720636a(12) =5489037036a(13) =11179326964a(14) =21624372014a(15) =40001698260a(16) =71163830416a(17) =122319408236a(18) =203920464114a(19) =330799604044a(20) =523606640180a(21) =810600392196