Powers of sqrt(17) rounded up.

Terms

a(0) =1a(1) =5a(2) =17a(3) =71a(4) =289a(5) =1192a(6) =4913a(7) =20257a(8) =83521a(9) =344366a(10) =1419857a(11) =5854221a(12) =24137569a(13) =99521747a(14) =410338673a(15) =1691869692a(16) =6975757441a(17) =28761784748a(18) =118587876497a(19) =488950340715