a(n) = floor((265/6)*4^(n-4) - n^2 - ((15+(-1)^(n-1))/6)* 2^(n-3)).
A185098
a(n) = floor((265/6)*4^(n-4) - n^2 - ((15+(-1)^(n-1))/6)* 2^(n-3)).
Terms
- a(0) =23a(1) =141a(2) =652a(3) =2735a(4) =11168a(5) =44975a(6) =180508a(7) =722823a(8) =2893168a(9) =11575127a(10) =46307132a(11) =185237279a(12) =740974336a(13) =2963930847a(14) =11855822524a(15) =47423422103a(16) =189694082672a(17) =758776856135
External references
- oeis: A185098