Alternate Lucas numbers - 2.

Terms

a(0) =0a(1) =1a(2) =5a(3) =16a(4) =45a(5) =121a(6) =320a(7) =841a(8) =2205a(9) =5776a(10) =15125a(11) =39601a(12) =103680a(13) =271441a(14) =710645a(15) =1860496a(16) =4870845a(17) =12752041a(18) =33385280a(19) =87403801a(20) =228826125a(21) =599074576a(22) =1568397605a(23) =4106118241a(24) =10749957120a(25) =28143753121a(26) =73681302245a(27) =192900153616a(28) =505019158605