Number of (n+2)X(2+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 0 2 4 5 7 or 9.
A251646
Number of (n+2)X(2+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 0 2 4 5 7 or 9.
Terms
- a(0) =448a(1) =908a(2) =1928a(3) =4008a(4) =10248a(5) =22904a(6) =49956a(7) =129296a(8) =300656a(9) =689192a(10) =1792064a(11) =4317696a(12) =10331264a(13) =26936064a(14) =66797136a(15) =165179552a(16) =431375936a(17) =1092206912a(18) =2762577872a(19) =7222018464a(20) =18536302352a(21) =47560605216a(22) =124411054752a(23) =322001817152
External references
- oeis: A251646