a(n) = A053445(n-2) - A053445(n-4).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =1a(8) =3a(9) =4a(10) =4a(11) =4a(12) =8a(13) =6a(14) =10a(15) =11a(16) =13a(17) =15a(18) =22a(19) =20a(20) =28a(21) =33a(22) =39a(23) =43a(24) =58a(25) =60a(26) =77a(27) =88a(28) =104a(29) =119