Equals two maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 3Xn array.
A221291
Equals two maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..3 3Xn array.
Terms
- a(0) =1a(1) =12a(2) =92a(3) =673a(4) =5912a(5) =48298a(6) =396846a(7) =3240527a(8) =26241353a(9) =211785583a(10) =1703772887a(11) =13679840407a(12) =109689414233a(13) =878752161168
External references
- oeis: A221291