a(n) = Sum_{k=0..n} (-1)^k * binomial(-2,k) * binomial(n*k,n-k).
A362084
a(n) = Sum_{k=0..n} (-1)^k * binomial(-2,k) * binomial(n*k,n-k).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =28a(4) =145a(5) =896a(6) =6328a(7) =50212a(8) =441489a(9) =4248370a(10) =44306306a(11) =496991848a(12) =5959111223a(13) =75977511442
External references
- oeis: A362084