Problem 52729. Easy Sequences 21: Combinatorial Summations

Create the function S(n), defined by the following summation:
The symbol is the combination function ('nchoosek(a,b)' in MATLAB). 'S(n)' always yields an integer value, if 'n' is a positive integer. Present the output modulo 1234567.
NOTE: S(n) may have positive or negative values. Therefore, please use the 'mod' function instead of the 'rem' function to ensure the result would be a positive modulus.
Solve

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68.75% Correct | 31.25% Incorrect
Last Solution submitted on Dec 22, 2025

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