Number of sequences with n copies each of 1, 2, 3 and longest increasing subsequence of length 3.
A047911
Number of sequences with n copies each of 1, 2, 3 and longest increasing subsequence of length 3.
Terms
- a(0) =1a(1) =47a(2) =1306a(3) =31451a(4) =729811a(5) =16928840a(6) =397222288a(7) =9450343019a(8) =227749730869
External references
- oeis: A047911