a(n) = MPR2(n, 4), where MPR2(n, x) is the (monic) minimal polynomial of 2*cos(2*Pi/n) as defined in A232624.

A309040

a(n) = MPR2(n, 4), where MPR2(n, x) is the (monic) minimal polynomial of 2*cos(2*Pi/n) as defined in A232624.

Terms

    a(0) =2a(1) =6a(2) =5a(3) =4a(4) =19a(5) =3a(6) =71a(7) =14a(8) =53a(9) =11a(10) =989a(11) =13a(12) =3691a(13) =41a(14) =145a(15) =194a(16) =51409a(17) =51a(18) =191861a(19) =181a(20) =2017a(21) =571a(22) =2672279a(23) =193a(24) =524899a(25) =2131a(26) =140453a(27) =2521a(28) =138907099a(29) =241

External references