Consider A010060 as a 2-adic number ...100110010110, then a(n) is its approximation up to 2^n.

Terms

a(0) =0a(1) =0a(2) =2a(3) =6a(4) =6a(5) =22a(6) =22a(7) =22a(8) =150a(9) =406a(10) =406a(11) =406a(12) =2454a(13) =2454a(14) =10646a(15) =27030a(16) =27030a(17) =92566a(18) =92566a(19) =92566a(20) =616854a(21) =616854a(22) =2714006a(23) =6908310a(24) =6908310a(25) =6908310a(26) =40462742a(27) =107571606a(28) =107571606a(29) =376007062