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..1 nX2 array.
A220275
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..1 nX2 array.
Terms
- a(0) =1a(1) =6a(2) =25a(3) =87a(4) =322a(5) =1168a(6) =4303a(7) =15680a(8) =57251a(9) =209919a(10) =765897a(11) =2798292a(12) =10239771a(13) =37404529a(14) =136700188a(15) =499846884a(16) =1826552660a(17) =6675971458a(18) =24404489928a(19) =89191936887a(20) =325998995843
External references
- oeis: A220275