Each term is previous term plus ceiling of root mean square of two previous terms.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =8a(5) =15a(6) =28a(7) =51a(8) =93a(9) =168a(10) =304a(11) =550a(12) =995a(13) =1799a(14) =3253a(15) =5882a(16) =10635a(17) =19229a(18) =34767a(19) =62861a(20) =113656a(21) =205497a(22) =371550a(23) =671782a(24) =1214618a(25) =2196094a(26) =3970654a(27) =7179153a(28) =12980288a(29) =23469047