Sequence : mathings in a n x n grid

Yuval Dekel dekelyuval at
Sun Oct 12 20:03:24 CEST 2003

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 ?


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