Sum{|d(i)-d(i-1)|: i=0,1,...,m}, where Sum{d(i)*3^i: i=0,1,...,m} is base 3 representation of n.

Terms

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