a(n) = Sum_{k=0..n} C(4*k,k)*C(4*(n-k),n-k).
A078995
a(n) = Sum_{k=0..n} C(4*k,k)*C(4*(n-k),n-k).
Terms
- a(0) =1a(1) =8a(2) =72a(3) =664a(4) =6184a(5) =57888a(6) =543544a(7) =5113872a(8) =48180456a(9) =454396000a(10) =4288773152a(11) =40503496536a(12) =382701222296
External references
- oeis: A078995