Number of (n+2) X 3 0..6 arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order.
A186907
Number of (n+2) X 3 0..6 arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order.
Terms
- a(0) =2066505a(1) =59969593a(2) =1276581035a(3) =22000126445a(4) =319741716426
External references
- oeis: A186907