Number of (n+1)X(1+1) 0..3 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.

A250700

Number of (n+1)X(1+1) 0..3 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) =100a(1) =536a(2) =2435a(3) =10050a(4) =38431a(5) =138957a(6) =480846a(7) =1607723a(8) =5230029a(9) =16642735a(10) =52021650a(11) =160257157a(12) =487831638a(13) =1470503122a(14) =4396997745a(15) =13060344863a(16) =38580263273a(17) =113449666793a(18) =332362403672a(19) =970677886757

External references