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Omni-MATH / An 8 by 8 grid of numbers obeys the following pattern: 1) The first row and…

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problem

An 8 by 8 grid of numbers obeys the following pattern: 1) The first row and first column consist of all 1s. 2) The entry in the iith row and jjth column equals the sum of the numbers in the (i−1)(i-1) by (j−1)(j-1) sub-grid with row less than ii and column less than jj. What is the number in the 8th row and 8th column?
Plain-text mathematical notation (without MathML)
An 8 by 8 grid of numbers obeys the following pattern: 1) The first row and first column consist of all 1s. 2) The entry in the ith row and jth column equals the sum of the numbers in the (i−1) by (j−1) sub-grid with row less than i and column less than j. What is the number in the 8th row and 8th column?
Original LaTeX notation
An 8 by 8 grid of numbers obeys the following pattern: 1) The first row and first column consist of all 1s. 2) The entry in the $i$th row and $j$th column equals the sum of the numbers in the $(i-1)$ by $(j-1)$ sub-grid with row less than $i$ and column less than $j$. What is the number in the 8th row and 8th column?

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