a(n) = least positive integer > a(n-1) and not (a(i)+a(j))^2 - a(k)^2 for 1<=i<j<k<=n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =10a(9) =12a(10) =14a(11) =16a(12) =18a(13) =19a(14) =20a(15) =22a(16) =23a(17) =26a(18) =27a(19) =30a(20) =31a(21) =34a(22) =35a(23) =38a(24) =40a(25) =42a(26) =43a(27) =46a(28) =48a(29) =49