Number of 5-matchings of the n X n grid graph.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =3388a(5) =157000a(6) =2135356a(7) =15836664a(8) =81324796a(9) =325679904a(10) =1088989348a(11) =3174085648a(12) =8301786980a(13) =19888285976a(14) =44304931948a(15) =92833927816a(16) =184597383660a(17) =350812701616a(18) =640815379476