a(n) = Sum_{k=0..n} (k+1) * 3^k * binomial(2*n+2,n-k).
A383832
a(n) = Sum_{k=0..n} (k+1) * 3^k * binomial(2*n+2,n-k).
Terms
- a(0) =1a(1) =10a(2) =78a(3) =548a(4) =3630a(5) =23148a(6) =143724a(7) =874888a(8) =5245038a(9) =31065500a(10) =182189348a(11) =1059775608a(12) =6122246572a(13) =35160205752a(14) =200902089240
External references
- oeis: A383832