a(n) = Sum_{k=0..n} binomial(5*k,k) / (4*k + 1).
A345368
a(n) = Sum_{k=0..n} binomial(5*k,k) / (4*k + 1).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =42a(4) =327a(5) =2857a(6) =26608a(7) =258488a(8) =2588933a(9) =26539288a(10) =277082658a(11) =2936050788a(12) =31494394563a(13) =341325970323
External references
- oeis: A345368