Number of zero-sum nX2 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors.
A202041
Number of zero-sum nX2 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors.
Terms
- a(0) =3a(1) =19a(2) =73a(3) =335a(4) =1593a(5) =7669a(6) =37311a(7) =184335a(8) =919889a(9) =4620477a(10) =23332387a(11) =118371541a(12) =602858159a(13) =3080279011a(14) =15782030681a(15) =81053501795a(16) =417143999201
External references
- oeis: A202041