Number of n X 5 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.

A201372

Number of n X 5 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.

Terms

    a(0) =2a(1) =6a(2) =22a(3) =80a(4) =268a(5) =786a(6) =2016a(7) =4608a(8) =9582a(9) =18446a(10) =33330a(11) =57136a(12) =93704a(13) =147994a(14) =226284a(15) =336384a(16) =487866a(17) =692310a(18) =963566a(19) =1318032a(20) =1774948a(21) =2356706a(22) =3089176a(23) =4002048a(24) =5129190a(25) =6509022a(26) =8184906a(27) =10205552a(28) =12625440a(29) =15505258

External references