Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX2 array.
A220529
Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX2 array.
Terms
- a(0) =1a(1) =6a(2) =27a(3) =107a(4) =461a(5) =1844a(6) =7502a(7) =29893a(8) =119342a(9) =473933a(10) =1881751a(11) =7461042a(12) =29575992a(13) =117195951a(14) =464344817a(15) =1839594735a(16) =7287640647a(17) =28869446541a(18) =114362678138a(19) =453029324891
External references
- oeis: A220529