Position of first even digit after decimal point in sqrt(n).

Terms

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