a(n) = sum_{k=0..n} C(n,k)*C(n+k,k)*(2*k+1)^2, where C(m,k) denotes the binomial coefficient m!/(k!*(m-k)!).
A180364
a(n) = sum_{k=0..n} C(n,k)*C(n+k,k)*(2*k+1)^2, where C(m,k) denotes the binomial coefficient m!/(k!*(m-k)!).
Terms
- a(0) =1a(1) =19a(2) =205a(3) =1839a(4) =14961a(5) =114483a(6) =839917a(7) =5975455a(8) =41524897a(9) =283272723a(10) =1903686093a(11) =12636115407a(12) =83007985425a(13) =540484102707
External references
- oeis: A180364