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Euler's partition theorem and the combinatorics of -sequences

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“Pascal-like” triangle for <strong>the</strong> l-nomial coefficient:<br />

1<br />

1 1<br />

1 3 1<br />

1 8 8 1<br />

1 21 56 21 1<br />

1 55 385 385 55 1<br />

1 144 2640 6930 2640 144 1<br />

Theorem<br />

( ) n (l) ( )<br />

= (a (l) n − 1 (l) (<br />

k<br />

k+1 − a(l) k ) + (a (l)<br />

n − 1<br />

k<br />

n−k − a(l) n−k−1 ) k − 1<br />

) (l)

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