a(n)=the sum of the (1,2)- and (1,3)-entries and twice the (1,4)-entry of the matrix P^n + T^n, where the 4 X 4 matrices P and T are defined by P=[0,1,0,0;0,0,1,0;0,0,0,1;1,0,0,0] and T=[0,1,0,0;0,0,1,0;0,0,0,1;1,0,0,1].
A109526
a(n)=the sum of the (1,2)- and (1,3)-entries and twice the (1,4)-entry of the matrix P^n + T^n, where the 4 X 4 matrices P and T are defined by P=[0,1,0,0;0,0,1,0;0,0,0,1;1,0,0,0] and T=[0,1,0,0;0,0,1,0;0,0,0,1;1,0,0,1].
Terms
- a(0) =0a(1) =2a(2) =2a(3) =4a(4) =2a(5) =4a(6) =5a(7) =8a(8) =8a(9) =12a(10) =16a(11) =23a(12) =29a(13) =41a(14) =56a(15) =78a(16) =105a(17) =146a(18) =201a(19) =278a(20) =381a(21) =527a(22) =727a(23) =1004a(24) =1383a(25) =1910a(26) =2636a(27) =3639a(28) =5020a(29) =6930
External references
- oeis: A109526