T(n,k)=Number of nXk 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
A201981
T(n,k)=Number of nXk 0..3 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.
Terms
- a(0) =4a(1) =4a(2) =4a(3) =4a(4) =30a(5) =4a(6) =4a(7) =72a(8) =72a(9) =4a(10) =4a(11) =131a(12) =1372a(13) =131a(14) =4a(15) =4a(16) =208a(17) =9260a(18) =9260a(19) =208a(20) =4a(21) =4a(22) =304a(23) =38112a(24) =408599a(25) =38112a(26) =304a(27) =4a(28) =4a(29) =420
External references
- oeis: A201981