Number of (n+1) X (2+1) 0..2 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.
A250892
Number of (n+1) X (2+1) 0..2 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) =127a(1) =431a(2) =1450a(3) =4750a(4) =15111a(5) =47061a(6) =144442a(7) =439056a(8) =1326285a(9) =3990883a(10) =11981256a(11) =35923998a(12) =107646283a(13) =322490625a(14) =966132822a(15) =2894737036a(16) =8674725225a(17) =26000484927a(18) =77943849220a(19) =233694315930a(20) =700761297831
External references
- oeis: A250892