Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..2 nX4 array.
A220374
Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..2 nX4 array.
Terms
- a(0) =4a(1) =94a(2) =2095a(3) =39780a(4) =722126a(5) =12480964a(6) =209958887a(7) =3466406061
External references
- oeis: A220374