a(n) = Sum_{k=0..n} (k+1) * 2^k * binomial(2*n+1,n-k).
A386955
a(n) = Sum_{k=0..n} (k+1) * 2^k * binomial(2*n+1,n-k).
Terms
- a(0) =1a(1) =7a(2) =42a(3) =235a(4) =1262a(5) =6594a(6) =33780a(7) =170475a(8) =850230a(9) =4200130a(10) =20585228a(11) =100220718a(12) =485164988a(13) =2337145360a(14) =11210274408a(15) =53567616267a(16) =255110184486
External references
- oeis: A386955