Number of distinct angles in all integer-sided triangles with all sides <= n.

Terms

a(0) =1a(1) =3a(2) =9a(3) =17a(4) =35a(5) =49a(6) =82a(7) =109a(8) =149a(9) =188a(10) =262a(11) =316a(12) =419a(13) =500a(14) =607a(15) =698a(16) =876a(17) =1004a(18) =1222a(19) =1383a(20) =1589a(21) =1782a(22) =2108a(23) =2318a(24) =2634a(25) =2914a(26) =3253a(27) =3564a(28) =4088a(29) =4411