Equals two maps: number of 4 X n binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 4 X n array.
A220331
Equals two maps: number of 4 X n binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 4 X n array.
Terms
- a(0) =1a(1) =37a(2) =508a(3) =6657a(4) =92093a(5) =1335202a(6) =18836493a(7) =265346645a(8) =3750121527
External references
- oeis: A220331