Second column of Lucas bisection triangle (even part).

Terms

a(0) =1a(1) =17a(2) =80a(3) =303a(4) =1039a(5) =3364a(6) =10493a(7) =31885a(8) =95032a(9) =279051a(10) =809771a(11) =2327372a(12) =6636025a(13) =18794633a(14) =52925984a(15) =148303719a(16) =413768263a(17) =1150029940a(18) =3185625077a(19) =8797726981a(20) =24230897416a(21) =66574108227