Number of (n+1) X (1+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.
A250891
Number of (n+1) X (1+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) =37a(1) =125a(2) =413a(3) =1333a(4) =4213a(5) =13111a(6) =40357a(7) =123271a(8) =374509a(9) =1133503a(10) =3421621a(11) =10309399a(12) =31021885a(13) =93262255a(14) =280198405a(15) =841455367a(16) =2526160141a(17) =7582215967a(18) =22754413909a(19) =68279363575a(20) =204871514077a(21) =614683748239
External references
- oeis: A250891