a(n) is the numerator of Sum_{k=0..n} 1 / (2*k+1)!.

A354211

a(n) is the numerator of Sum_{k=0..n} 1 / (2*k+1)!.

Terms

    a(0) =1a(1) =7a(2) =47a(3) =5923a(4) =426457a(5) =15636757a(6) =7318002277a(8) =603180793741

External references