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A triangular arrangement of numbers very similar to Pascal's triangle.
Begin as you would if you were constructing Pascal's triangle, with a 1 in the top row, and that row  numbered 0, and the 1's position  as 0.
Now, for the next value, add up the two values above, but then subtract
From this point forward, do the same for every even-numbered position in an even-numbered row. Instead of calculating the binomial coefficient, it can be looked up in Pascal's triangle.
This triangle was first studied by the Serbian chemist Sima Losanitsch, but has since been found to have applications in graph theory and combinatorics.
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- S. M. Losanitsch, Die Isomerie-Arten bei den Homologen der Paraffin-Reihe, Chem. Ber. 30 (1897), 1917-1926.
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