a(n) = 12*binomial(n, 5).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =12a(6) =72a(7) =252a(8) =672a(9) =1512a(10) =3024a(11) =5544a(12) =9504a(13) =15444a(14) =24024a(15) =36036a(16) =52416a(17) =74256a(18) =102816a(19) =139536a(20) =186048a(21) =244188a(22) =316008a(23) =403788a(24) =510048a(25) =637560a(26) =789360a(27) =968760a(28) =1179360a(29) =1425060