Number of matchings in the n-antiprism graph.

Terms

a(0) =3a(1) =15a(2) =51a(3) =191a(4) =708a(5) =2631a(6) =9775a(7) =36319a(8) =134943a(9) =501380a(10) =1862875a(11) =6921503a(12) =25716811a(13) =95550687a(14) =355018116a(15) =1319068095a(16) =4900991135a(17) =18209608887a(18) =67657713855a(19) =251381908996a(20) =934008268531