Powers of sqrt(11) rounded down.

Terms

a(0) =1a(1) =3a(2) =11a(3) =36a(4) =121a(5) =401a(6) =1331a(7) =4414a(8) =14641a(9) =48558a(10) =161051a(11) =534145a(12) =1771561a(13) =5875603a(14) =19487171a(15) =64631634a(16) =214358881a(17) =710947978a(18) =2357947691a(19) =7820427766a(20) =25937424601a(21) =86024705429a(22) =285311670611