a(n) = n-th nonnegative integer k satisfying |cos(k)*cos(k+2)| > (cos(k+1))^2.

Terms

a(0) =0a(1) =1a(2) =4a(3) =7a(4) =10a(5) =13a(6) =16a(7) =19a(8) =20a(9) =22a(10) =23a(11) =26a(12) =29a(13) =32a(14) =35a(15) =38a(16) =41a(17) =42a(18) =44a(19) =45a(20) =48a(21) =51a(22) =54a(23) =57a(24) =60a(25) =63a(26) =64a(27) =66a(28) =67a(29) =70