a(n) = Sum_{k=0..n}((binomial(2*k,k)/(k+1)*binomial(2*n+2,n-k))).
A270530
a(n) = Sum_{k=0..n}((binomial(2*k,k)/(k+1)*binomial(2*n+2,n-k))).
Terms
- a(0) =1a(1) =5a(2) =23a(3) =105a(4) =484a(5) =2267a(6) =10821a(7) =52705a(8) =262010a(9) =1328768a(10) =6867266a(11) =36115455a(12) =192954358a(13) =1045481465a(14) =5735154907a(15) =31802349105a(16) =178010615678
External references
- oeis: A270530