a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+2*k-1,n-k).
A389321
a(n) = Sum_{k=0..n} binomial(n,k) * binomial(n+2*k-1,n-k).
Terms
- a(0) =1a(1) =1a(2) =7a(3) =37a(4) =203a(5) =1146a(6) =6577a(7) =38200a(8) =223883a(9) =1321390a(10) =7843022a(11) =46766435a(12) =279930389a(13) =1681024931a(14) =10122899542a(15) =61105605627a(16) =369633643323
External references
- oeis: A389321