Sequences from the quartic oscillator.

Terms

a(0) =0a(1) =24a(2) =384a(3) =2064a(4) =7104a(5) =18984a(6) =43008a(7) =86688a(8) =160128a(9) =276408a(10) =451968a(11) =706992a(12) =1065792a(13) =1557192a(14) =2214912a(15) =3077952a(16) =4190976a(17) =5604696a(18) =7376256a(19) =9569616a(20) =12255936a(21) =15513960a(22) =19430400a(23) =24100320a(24) =29627520a(25) =36124920a(26) =43714944a(27) =52529904a(28) =62712384a(29) =74415624