Number of n X 7 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
A201980
Number of n X 7 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
Terms
- a(0) =4a(1) =420a(2) =301612a(3) =729771318
External references
- oeis: A201980