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Parity restrictions

Exponential generating functions

Set partitionsAny # of blocksOdd # of blocksEven # of blocks
Any block sizeseex1e^{e^x - 1}sinh(ex1)\sinh(e^x - 1)cosh(ex1)\cosh(e^x - 1)
Odd block sizesesinhxe^{\sinh x}sinh(sinhx)\sinh(\sinh x)cosh(sinhx)\cosh(\sinh x)
Even block sizesecoshx1e^{\cosh x - 1}sinh(coshx1)\sinh(\cosh x - 1)cosh(coshx1)\cosh(\cosh x - 1)

References

Flajolet, Sedgewick: Analytic Combinatorics

Comtet: Advanced Combinatorics

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