(Terms in A029631)/2.

Terms

a(0) =4a(1) =7a(2) =13a(3) =20a(4) =10a(5) =45a(6) =13a(7) =50a(8) =112a(9) =161a(10) =63a(11) =162a(12) =273a(13) =16a(14) =225a(15) =435a(16) =588a(17) =660a(18) =1023a(19) =19a(20) =111a(21) =396a(22) =1683a(23) =2178a(24) =130a(25) =507a(26) =3861a(27) =22a(28) =637a(29) =4004