Number of nX4 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
A201977
Number of nX4 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
Terms
- a(0) =4a(1) =131a(2) =9260a(3) =408599a(4) =8002304a(5) =91893727a(6) =729771318a(7) =4412536785a(8) =21616887220a(9) =89573637672a(10) =323882961806
External references
- oeis: A201977