Least k such that the base 4 representation of n begins at s(k), where s=A030413.

Terms

a(0) =1a(1) =2a(2) =3a(3) =24a(4) =4a(5) =1a(6) =17a(7) =6a(8) =21a(9) =28a(10) =2a(11) =75a(12) =3a(13) =27a(14) =41a(15) =24a(16) =79a(17) =82a(18) =130a(19) =81a(20) =9a(21) =4a(22) =31a(23) =5a(24) =20a(25) =51a(26) =1a(27) =136a(28) =17a(29) =32