a(n)=A089551(n)/2.

Terms

a(0) =2a(1) =21a(2) =35a(3) =68a(4) =161a(5) =14a(6) =155a(7) =294a(8) =306a(9) =423a(10) =483a(11) =497a(12) =902a(13) =231a(14) =984a(15) =869a(16) =776a(17) =315a(18) =1209a(19) =1898a(20) =1143a(21) =1547a(22) =2670a(23) =1610a(24) =1020a(25) =3390a(26) =2585a(27) =3927a(28) =2505a(29) =2189