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 x(i,j)+x(i-1,j) in the j direction.
A250884
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 x(i,j)+x(i-1,j) in the j direction.
Terms
- a(0) =640002a(1) =2304492a(2) =5640102a(3) =11227928a(4) =19649066a(5) =31484612a(6) =47315662a(7) =67723312a(8) =93288658a(9) =124592796a(10) =162216822a(11) =206741832a(12) =258748922a(13) =318819188a(14) =387533726a(15) =465473632a(16) =553220002a(17) =651353932a(18) =760456518a(19) =881108856a(20) =1013892042a(21) =1159387172
External references
- oeis: A250884