a(n) = 2 * A079500(n) - A079500(n+1).

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =2a(6) =4a(7) =5a(8) =9a(9) =14a(10) =24a(11) =40a(12) =70a(13) =120a(14) =211a(15) =371a(16) =658a(17) =1172a(18) =2102a(19) =3786a(20) =6856a(21) =12470a(22) =22782a(23) =41789a(24) =76947a(25) =142180a(26) =263578a(27) =490104a(28) =913858a(29) =1708386