Square of the (3,1)-entry of the 3 X 3 matrix M^n, where M = [1,0,0; 1,1,0; 1,i,1].

Terms

a(0) =1a(1) =5a(2) =18a(3) =52a(4) =125a(5) =261a(6) =490a(7) =848a(8) =1377a(9) =2125a(10) =3146a(11) =4500a(12) =6253a(13) =8477a(14) =11250a(15) =14656a(16) =18785a(17) =23733a(18) =29602a(19) =36500a(20) =44541a(21) =53845a(22) =64538a(23) =76752a(24) =90625a(25) =106301a(26) =123930a(27) =143668a(28) =165677a(29) =190125