Number of n X 2 0..4 arrays with no element equal to another at a city block distance of exactly two, and new values 0..4 introduced in row major order.
A222940
Number of n X 2 0..4 arrays with no element equal to another at a city block distance of exactly two, and new values 0..4 introduced in row major order.
Terms
- a(0) =2a(1) =7a(2) =33a(3) =273a(4) =2433a(5) =21873a(6) =196833a(7) =1771473a(8) =15943233a(9) =143489073a(10) =1291401633a(11) =11622614673a(12) =104603532033a(13) =941431788273
External references
- oeis: A222940