Number of up-down sequences with n copies each of 1,2,...,5.
A276637
Number of up-down sequences with n copies each of 1,2,...,5.
Terms
- a(0) =1a(1) =16a(2) =936a(3) =87336a(4) =9929000a(5) =1267945800a(6) =174470351760
External references
- oeis: A276637