Fourth column of Lucas bisection triangle (even part).

Terms

a(0) =1a(1) =70a(2) =905a(3) =6666a(4) =37580a(5) =181074a(6) =786715a(7) =3176210a(8) =12139859a(9) =44471340a(10) =157483176a(11) =542468100a(12) =1826073525a(13) =6028577566a(14) =19573942365a(15) =62643859374a(16) =197971385860a(17) =618724626390