14Jan/130

## An elegant puzzle at the New York Times

Joshua Zucker shared this great Numberplay puzzle at the New York Times Wordplay Blog:

Start with a first row with two number ones separated by a space:

Row 1: 1 1

For each subsequent row, insert the sum between each two adjacent numbers, so you get:

Row 2: 1 2 1

Row 3: 1 3 2 3 1

Row 4: 1 4 3 5 2 5 3 4 1

How many 2013s are in row 2013?

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