Number of times n consecutively appears in A218461.

Terms

a(0) =2a(1) =3a(2) =5a(3) =10a(4) =21a(5) =44a(6) =92a(7) =216a(8) =446a(9) =1018a(10) =2356a(11) =5408a(12) =12559a(13) =29709a(14) =70446a(15) =169008a(16) =407539a(17) =988057a(18) =2415086a(19) =5927972