Powers of sqrt(8) rounded up.

Terms

a(0) =1a(1) =3a(2) =8a(3) =23a(4) =64a(5) =182a(6) =512a(7) =1449a(8) =4096a(9) =11586a(10) =32768a(11) =92682a(12) =262144a(13) =741456a(14) =2097152a(15) =5931642a(16) =16777216a(17) =47453133a(18) =134217728a(19) =379625063a(20) =1073741824a(21) =3037000500a(22) =8589934592a(23) =24296004000a(24) =68719476736