(1,3)-entry of the 3 X 3 matrix M^n, where M = {{0, -1, 1}, {1, 1, 0}, {0, 1, 1}}.

Terms

a(0) =0a(1) =1a(2) =1a(3) =0a(4) =0a(5) =2a(6) =4a(7) =4a(8) =4a(9) =8a(10) =16a(11) =24a(12) =32a(13) =48a(14) =80a(15) =128a(16) =192a(17) =288a(18) =448a(19) =704a(20) =1088a(21) =1664a(22) =2560a(23) =3968a(24) =6144a(25) =9472a(26) =14592a(27) =22528a(28) =34816a(29) =53760