The middle coefficient in the minimal polynomial for (2*cos(Pi/15))^n.

A306611

The middle coefficient in the minimal polynomial for (2*cos(Pi/15))^n.

Terms

    a(0) =-4a(1) =26a(2) =-49a(3) =246a(4) =-619a(5) =2621a(6) =-7774a(7) =30126a(8) =-97879a(9) =363131a(10) =-1237504a(11) =4497801a(12) =-15702574a(13) =56538746a(14) =-199764994a(15) =716265246a(16) =-2545683874a(17) =9110943101a(18) =-32474838004a(19) =116135818131a(20) =-414537600379

External references