Powers of cube root of 15 rounded down.

Terms

a(0) =1a(1) =2a(2) =6a(3) =15a(4) =36a(5) =91a(6) =225a(7) =554a(8) =1368a(9) =3375a(10) =8323a(11) =20527a(12) =50625a(13) =124851a(14) =307911a(15) =759375a(16) =1872779a(17) =4618672a(18) =11390625a(19) =28091696a(20) =69280082a(21) =170859375a(22) =421375453a(23) =1039201231a(24) =2562890625a(25) =6320631804a(26) =15588018473a(27) =38443359375a(28) =94809477068a(29) =233820277107