a(n) is the number of reduced Latin trapezoids of height 3, whose top row has n boxes, the middle row has n+1 boxes, and the bottom row has n+2 boxes.
A347927
a(n) is the number of reduced Latin trapezoids of height 3, whose top row has n boxes, the middle row has n+1 boxes, and the bottom row has n+2 boxes.
Terms
- a(0) =1a(1) =6a(2) =68a(3) =1670a(4) =67295a(5) =3825722a(6) =285667270a(7) =26889145828
External references
- oeis: A347927