Number of minimal edge cuts in the 4 X n grid graph.

Terms

a(0) =3a(1) =28a(2) =146a(3) =627a(4) =2471a(5) =9292a(6) =33878a(7) =120771a(8) =423251a(9) =1463908a(10) =5011690a(11) =17021179a(12) =57450167a(13) =192966908a(14) =645696454a(15) =2154226075a(16) =7170606795a(17) =23825657596a(18) =79055534746a(19) =262031761435a(20) =867792229799