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With unlabelled structures, an [[ordinary generating function]] (OGF) is used. The OGF of a sequence <math>A_{n}</math> is defined as
:<math>A(x)=\sum_{n=0}^{\infty}A_{n}x^{n}
===Product===
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Line 20:
With unlabelled structures, an [[ordinary generating function]] (OGF) is used. The OGF of a sequence <math>A_{n}</math> is defined as
:<math>A(x)=\sum_{n=0}^{\infty}A_{n}x^{n}
===Product===
| |||