Number of nX2 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.
A283516
Number of nX2 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =5a(4) =28a(5) =145a(6) =703a(7) =3288a(8) =14980a(9) =66958a(10) =294864a(11) =1283142a(12) =5529698a(13) =23637592a(14) =100350059a(15) =423511851a(16) =1778210188a(17) =7432635711a(18) =30943479193a(19) =128365649488a(20) =530810149910
External references
- oeis: A283516