Column 5 of A061315.

Terms

a(0) =0a(1) =1a(2) =28a(3) =1216a(4) =37324a(5) =700876a(6) =8719921a(7) =78503068a(8) =547643916a(9) =3114359073a(10) =14992411852a(11) =62860750876a(12) =234647983648a(13) =793316418076