a(n) is the number of regions into which the plane is divided by n^2 circles of radius 1, the centers of which are located at the nodes of a square lattice n X n.
A387883
a(n) is the number of regions into which the plane is divided by n^2 circles of radius 1, the centers of which are located at the nodes of a square lattice n X n.
Terms
- a(0) =1a(1) =2a(2) =14a(3) =41a(4) =82a(5) =137a(6) =206a(7) =289a(8) =386a(9) =497a(10) =622a(11) =761a(12) =914a(13) =1081a(14) =1262a(15) =1457a(16) =1666a(17) =1889a(18) =2126a(19) =2377a(20) =2642a(21) =2921a(22) =3214a(23) =3521a(24) =3842a(25) =4177a(26) =4526a(27) =4889a(28) =5266a(29) =5657
External references
- oeis: A387883