Product of Pell and Lucas numbers.

Terms

a(0) =0a(1) =1a(2) =6a(3) =20a(4) =84a(5) =319a(6) =1260a(7) =4901a(8) =19176a(9) =74860a(10) =292494a(11) =1142459a(12) =4462920a(13) =17433181a(14) =68099226a(15) =266014100a(16) =1039126224a(17) =4059116419a(18) =15856045380a(19) =61938144041a(20) =241947712356a(21) =945115407340