Number of permutations of 4 copies of 1..n with all adjacent differences <= 3 in absolute value.
A177300
Number of permutations of 4 copies of 1..n with all adjacent differences <= 3 in absolute value.
Terms
- a(0) =1a(1) =1a(2) =70a(3) =34650a(4) =63063000a(5) =42251309100
External references
- oeis: A177300