Even terms in A118854.

Terms

a(0) =2a(1) =8a(2) =24a(3) =636a(4) =12318a(5) =13446a(6) =32396a(7) =46206a(8) =133788a(9) =162926a(10) =181428a(11) =359906a(12) =439098a(13) =453168a(14) =485238a(15) =508200a(16) =739024a(17) =840852a(18) =1007580a(19) =1410120a(20) =1577066a(21) =2056076a(22) =2126134a(23) =2422566a(24) =2512406a(25) =3275832a(26) =3307848a(27) =3457758a(28) =4481014a(29) =4698784