a(n) = 0 for n <= 3; thereafter a(n) = a(n-2)+A238825(n-3).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =2a(8) =6a(9) =13a(10) =33a(11) =77a(12) =191a(13) =464a(14) =1147a(15) =2819a(16) =6956a(17) =17132a(18) =42228a(19) =104026a(20) =256303a(21) =631394a(22) =1555488a(23) =3831945a(24) =9440141a(25) =23256017a(26) =57292037a(27) =141140858a(28) =347705663a(29) =856585345