Number of (7+1) X (n+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.
A250859
Number of (7+1) X (n+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) =983950a(1) =5480917a(2) =20067117a(3) =57570016a(4) =140301126a(5) =303858745a(6) =601566177a(7) =1109545432a(8) =1932426406a(9) =3209691541a(10) =5122655965a(11) =7902083112a(12) =11836435822a(13) =17280762921a(14) =24666221281a(15) =34510233360a(16) =47427280222a(17) =64140330037a(18) =85492902061
External references
- oeis: A250859