a(n) is the number of integer lattice points inside the right triangle with legs 3n and 4n (and hypotenuse 5n).

A126587

a(n) is the number of integer lattice points inside the right triangle with legs 3n and 4n (and hypotenuse 5n).

Terms

    a(0) =3a(1) =17a(2) =43a(3) =81a(4) =131a(5) =193a(6) =267a(7) =353a(8) =451a(9) =561a(10) =683a(11) =817a(12) =963a(13) =1121a(14) =1291a(15) =1473a(16) =1667a(17) =1873a(18) =2091a(19) =2321a(20) =2563a(21) =2817a(22) =3083a(23) =3361a(24) =3651a(25) =3953a(26) =4267a(27) =4593a(28) =4931a(29) =5281

External references