Powers of sqrt(11) rounded up.

Terms

a(0) =1a(1) =4a(2) =11a(3) =37a(4) =121a(5) =402a(6) =1331a(7) =4415a(8) =14641a(9) =48559a(10) =161051a(11) =534146a(12) =1771561a(13) =5875604a(14) =19487171a(15) =64631635a(16) =214358881a(17) =710947979a(18) =2357947691a(19) =7820427767a(20) =25937424601a(21) =86024705430a(22) =285311670611