Number of permutations of 4 copies of 1..n with all adjacent differences <= 1 in absolute value.
A177298
Number of permutations of 4 copies of 1..n with all adjacent differences <= 1 in absolute value.
Terms
- a(0) =1a(1) =1a(2) =70a(3) =780a(4) =11482a(5) =135040a(6) =1543862a(7) =16699380a(8) =175280570a(9) =1792874048a(10) =17990831182a(11) =177773616180
External references
- oeis: A177298