Generalized Pellian with second term equal to 5.

Terms

a(0) =1a(1) =5a(2) =11a(3) =27a(4) =65a(5) =157a(6) =379a(7) =915a(8) =2209a(9) =5333a(10) =12875a(11) =31083a(12) =75041a(13) =181165a(14) =437371a(15) =1055907a(16) =2549185a(17) =6154277a(18) =14857739a(19) =35869755a(20) =86597249a(21) =209064253a(22) =504725755a(23) =1218515763a(24) =2941757281a(25) =7102030325a(26) =17145817931a(27) =41393666187a(28) =99933150305a(29) =241259966797