a(n) = Sum_{k=0..n+1}(binomial(n-1,k)/(k+1)*binomial(n+k+1,n-k)).
A262441
a(n) = Sum_{k=0..n+1}(binomial(n-1,k)/(k+1)*binomial(n+k+1,n-k)).
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =58a(5) =226a(6) =924a(7) =3910a(8) =16979a(9) =75232a(10) =338776a(11) =1545886a(12) =7132580a(13) =33219086a(14) =155963851a(15) =737383488a(16) =3507680650a(17) =16776206680a(18) =80622416976a(19) =389123999656
External references
- oeis: A262441