a(n) = floor(sqrt(a(n-1)^2 + a(n-2)^2)), a(1)=10, a(2)=30.

Terms

a(0) =10a(1) =30a(2) =31a(3) =43a(4) =53a(5) =68a(6) =86a(7) =109a(8) =138a(9) =175a(10) =222a(11) =282a(12) =358a(13) =455a(14) =578a(15) =735a(16) =935a(17) =1189a(18) =1512a(19) =1923a(20) =2446a(21) =3111a(22) =3957a(23) =5033a(24) =6402a(25) =8143a(26) =10358a(27) =13175a(28) =16759a(29) =21317