Generalized Pellian with second term equal to 10.

Terms

a(0) =1a(1) =10a(2) =21a(3) =52a(4) =125a(5) =302a(6) =729a(7) =1760a(8) =4249a(9) =10258a(10) =24765a(11) =59788a(12) =144341a(13) =348470a(14) =841281a(15) =2031032a(16) =4903345a(17) =11837722a(18) =28578789a(19) =68995300a(20) =166569389a(21) =402134078a(22) =970837545a(23) =2343809168a(24) =5658455881