Number of (4+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
A250786
Number of (4+1) X (n+1) 0..1 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.
Terms
- a(0) =72a(1) =196a(2) =482a(3) =1152a(4) =2640a(5) =5882a(6) =12796a(7) =27344a(8) =57610a(9) =120060a(10) =248072a(11) =509158a(12) =1039532a(13) =2113580a(14) =4283210a(15) =8657344a(16) =17462056a(17) =35162842a(18) =70712260a(19) =142050352a(20) =285113682a(21) =571866796a(22) =1146386672a(23) =2297066582a(24) =4601080260a(25) =9213401692
External references
- oeis: A250786