Number of nX7 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
A201699
Number of nX7 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
Terms
- a(0) =3a(1) =60a(2) =3838a(3) =607919a(4) =142436489a(5) =27102769900
External references
- oeis: A201699