a(n) = Sum_{k=0..n} 4^(n-k) * binomial(n-1,n-k) * binomial(2*k,k).
A360319
a(n) = Sum_{k=0..n} 4^(n-k) * binomial(n-1,n-k) * binomial(2*k,k).
Terms
- a(0) =1a(1) =2a(2) =14a(3) =100a(4) =726a(5) =5340a(6) =39692a(7) =297544a(8) =2245990a(9) =17050796a(10) =130061412a(11) =996078456a(12) =7654571772a(13) =58995989400a(14) =455857911768
External references
- oeis: A360319