Number of nX6 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
A201979
Number of nX6 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
Terms
- a(0) =4a(1) =304a(2) =117744a(3) =91893727a(4) =48452117136
External references
- oeis: A201979