Number of real roots of x - x^3/3! + x^5/5! - ... + (-1)^n*x^(2n+1)/(2n+1)!.

Terms

a(0) =1a(1) =3a(2) =1a(3) =3a(4) =5a(5) =3a(6) =5a(7) =7a(8) =5a(9) =7a(10) =5a(11) =7a(12) =9a(13) =7a(14) =9a(15) =7a(16) =9a(17) =11a(18) =9a(19) =11a(20) =13a(21) =11a(22) =13a(23) =11a(24) =13a(25) =15a(26) =13a(27) =15a(28) =17a(29) =15