Number of (2+1)X(n+1) 0..2 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

A250634

Number of (2+1)X(n+1) 0..2 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.

Terms

    a(0) =125a(1) =654a(2) =2969a(3) =12360a(4) =49310a(5) =190213a(6) =720347a(7) =2690076a(8) =9964237a(9) =36686400a(10) =134581437a(11) =492406440a(12) =1798700175a(13) =6562904559a(14) =23928907661a(15) =87203461550a(16) =317693877115

External references