Powers of cube root of 2 rounded up.

Terms

a(0) =1a(1) =2a(2) =2a(3) =2a(4) =3a(5) =4a(6) =4a(7) =6a(8) =7a(9) =8a(10) =11a(11) =13a(12) =16a(13) =21a(14) =26a(15) =32a(16) =41a(17) =51a(18) =64a(19) =81a(20) =102a(21) =128a(22) =162a(23) =204a(24) =256a(25) =323a(26) =407a(27) =512a(28) =646a(29) =813