Number of minimal edge covers in the n-trapezohedral graph.

Terms

a(0) =1a(1) =9a(2) =49a(3) =189a(4) =651a(5) =2138a(6) =6847a(7) =21805a(8) =69781a(9) =225260a(10) =734119a(11) =2413746a(12) =7995417a(13) =26639534a(14) =89150537a(15) =299309821a(16) =1007213417a(17) =3394930835a(18) =11456074815a(19) =38688727608a(20) =130728462411a(21) =441894675073