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

A250730

Number of (1+1)X(n+1) 0..1 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) =9a(1) =22a(2) =50a(3) =114a(4) =257a(5) =579a(6) =1302a(7) =2927a(8) =6578a(9) =14782a(10) =33216a(11) =74637a(12) =167709a(13) =376840a(14) =846753a(15) =1902638a(16) =4275190a(17) =9606266a(18) =21585085a(19) =48501247a(20) =108981314a(21) =244878791a(22) =550237650a(23) =1236372778a(24) =2778104416a(25) =6242343961a(26) =14026419561a(27) =31517078668

External references