Number of nX5 0..4 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.
A200987
Number of nX5 0..4 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.
Terms
- a(0) =1a(1) =21a(2) =140a(3) =1095a(4) =4919a(5) =27000a(6) =97341a(7) =383172a(8) =1188521a(9) =3704820a(10) =9947816a(11) =27240277a(12) =65292069a(13) =157646021a(14) =349738426a(15) =770969390a(16) =1585648871a(17) =3256248216a(18) =6303135880a(19) =12177430692a(20) =22459794938a(21) =41128002746a(22) =72582886199a(23) =127586136583
External references
- oeis: A200987