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We evaluate the nested sum $\sum_{a_{n - 1} = c}^{a_n } {\sum_{a_{n - 2} =c}^{a_{n - 1} } { \cdots \sum_{a_0 = c}^{a_1 } {x^{a_0 } } } }$ where $a_n$ and$c$ are any integers and $x$ is a real or complex variable. Consequently, weevaluate multiple sums involving the terms of a general second order sequence,the Horadam sequence $(W_j(a,b;p,q))$, defined for all non-negative integers$j$ by the recurrence relation $W_0 = a,\,W_1 = b;\,W_j = pW_{j - 1} - qW_{j -2}\, (j \ge 2)$; where $a$, $b$, $p$ and $q$ are arbitrary complex numbers,with $p\ne 0$, $q\ne 0$.

Multiple sums involving the terms of a general second order sequence of numbers