Sequence : mathings in a n x n grid

[Yuval Dekel]

Sequence A004003 gives the number of perfect matchings of a 2n x 2n grid .

Let a(n) = number of matchings (not just perfect) in a n x n grid .

Is a(n) in the OEIS ?

Thanks,Yuval

http://www.research.att.com/projects/OEIS?Anum=A004003

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