bigintegers

c++ library for big integers and for rational numbers. Class BigUnsigned presents big unsigned integer. Class BigInteger presents big signed integer. Template class Fraction presents rational numbers.
Sample counts Bernoulli numbers and coefficients of polynomial of sum power of natural numbers. For example S_2(n)=1^2+2^2+...+n^2=1/3 n^3 + 1/2 n^2 +n/6. Also counts S_i(n) as linear combination of binomial coefficients. For example S_2(n)=C^1_n + 3 C^2_n + 2 C^3_n