(1-2*cos(1/11*Pi))^n+(1+2*cos(2/11*Pi))^n+(1-2*cos(3/11*Pi))^n+(1+2*cos(4/11*Pi))^n+(1-2*cos(5/11*Pi))^n.
A062883
(1-2*cos(1/11*Pi))^n+(1+2*cos(2/11*Pi))^n+(1-2*cos(3/11*Pi))^n+(1+2*cos(4/11*Pi))^n+(1-2*cos(5/11*Pi))^n.
Terms
- a(0) =4a(1) =12a(2) =25a(3) =64a(4) =159a(5) =411a(6) =1068a(7) =2808a(8) =7423a(9) =19717a(10) =52529a(11) =140251a(12) =375015a(13) =1003770a(14) =2688570a(15) =7204696a(16) =19313075a(17) =51782613a(18) =138861732a(19) =372414289a(20) =998851473a(21) =2679146955a(22) =7186319506a(23) =19276417059a(24) =51707411684a(25) =138702360471
External references
- oeis: A062883