a(n) = floor(sqrt(a(n-1)^2 + a(n-2)^2)), a(1)=100, a(2)=300.

Terms

a(0) =100a(1) =300a(2) =316a(3) =435a(4) =537a(5) =691a(6) =875a(7) =1114a(8) =1416a(9) =1801a(10) =2290a(11) =2913a(12) =3705a(13) =4713a(14) =5994a(15) =7624a(16) =9698a(17) =12335a(18) =15690a(19) =19958a(20) =25386a(21) =32291a(22) =41075a(23) =52248a(24) =66460a(25) =84538a(26) =107534a(27) =136785a(28) =173993a(29) =221322