Denominator of Sum_{k=1..n} 1/A077800(k), numerator=A074042.

A074043

Denominator of Sum_{k=1..n} 1/A077800(k), numerator=A074042.

Terms

    a(0) =3a(1) =15a(2) =15a(3) =105a(4) =1155a(5) =15015a(6) =255255a(7) =4849845a(8) =140645505a(9) =4360010655a(10) =178760436855

External references