a(0) = 0, a(1) = 1 and for n >= 2, a(n) = floor(sqrt(2 * (a(n-2)^2 + a(n-1)^2))).

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =3a(5) =5a(6) =8a(7) =13a(8) =21a(9) =34a(10) =56a(11) =92a(12) =152a(13) =251a(14) =414a(15) =684a(16) =1130a(17) =1868a(18) =3087a(19) =5102a(20) =8433a(21) =13938a(22) =23038a(23) =38079a(24) =62940a(25) =104033a(26) =171955a(27) =284223a(28) =469789a(29) =776510