a(n) = 4*(-3)^n + 3*(-2)^n + 3*2^n - (-3)^n*2^(n + 1) + 2*3^n*(2^n - 2).

A381134

a(n) = 4*(-3)^n + 3*(-2)^n + 3*2^n - (-3)^n*2^(n + 1) + 2*3^n*(2^n - 2).

Terms

    a(0) =0a(1) =24a(2) =648a(3) =96a(4) =29160a(5) =384a(6) =1102248a(7) =1536a(8) =40153320a(9) =6144a(10) =1449771048a(11) =24576a(12) =52230021480a(13) =98304a(15) =393216a(17) =1572864a(19) =6291456a(21) =25165824a(23) =100663296

External references