a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(4*k,k) / (3*k + 1).
A346680
a(n) = Sum_{k=0..n} (-1)^(n-k) * binomial(4*k,k) / (3*k + 1).
Terms
- a(0) =1a(1) =0a(2) =4a(3) =18a(4) =122a(5) =847a(6) =6237a(7) =47583a(8) =373149a(9) =2989111a(10) =24354777a(11) =201214021a(12) =1681719343a(13) =14193619647a(14) =120800146953
External references
- oeis: A346680