a(n) = A051717(2n) + A051717(2n+1).

Terms

a(0) =3a(1) =9a(2) =60a(3) =84a(4) =60a(5) =132a(6) =5460a(7) =12a(8) =1020a(9) =1596a(10) =660a(11) =276a(12) =5460a(13) =12a(14) =1740a(15) =28644a(16) =1020a(17) =12a(18) =3838380a(19) =12a(20) =27060a(21) =3612a(22) =1380a(23) =564a(24) =92820a(25) =132a(26) =3180a(27) =1596a(28) =1740a(29) =708