T(n,k)=Number of nXk 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.

A201375

T(n,k)=Number of nXk 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.

Terms

    a(0) =2a(1) =2a(2) =2a(3) =2a(4) =3a(5) =2a(6) =2a(7) =4a(8) =4a(9) =2a(10) =2a(11) =5a(12) =8a(13) =5a(14) =2a(15) =2a(16) =6a(17) =14a(18) =14a(19) =6a(20) =2a(21) =2a(22) =7a(23) =22a(24) =36a(25) =22a(26) =7a(27) =2a(28) =2a(29) =8

External references