a(n) = A000930(n) + A000930(n+3) + 4.

Terms

a(0) =7a(1) =8a(2) =9a(3) =12a(4) =16a(5) =21a(6) =29a(7) =41a(8) =58a(9) =83a(10) =120a(11) =174a(12) =253a(13) =369a(14) =539a(15) =788a(16) =1153a(17) =1688a(18) =2472a(19) =3621a(20) =5305a(21) =7773a(22) =11390a(23) =16691a(24) =24460a(25) =35846a(26) =52533a(27) =76989a(28) =112831a(29) =165360