Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
A222680
Number of 2Xn 0..3 arrays with no more than floor(2Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =2a(1) =1a(2) =5a(3) =10a(4) =25a(5) =150a(6) =359a(7) =2249a(8) =6511a(9) =39991a(10) =119033a(11) =747758a(12) =2254819a(13) =14115927a(14) =43486517a(15) =268330409a(16) =844434635a(17) =5129191736a(18) =16468845241a(19) =98454511005a(20) =322307191185
External references
- oeis: A222680