Number of minimal edge cuts in the 3 X n grid graph.

Terms

a(0) =2a(1) =15a(2) =53a(3) =146a(4) =356a(5) =809a(6) =1759a(7) =3716a(8) =7702a(9) =15763a(10) =31993a(11) =64582a(12) =129912a(13) =260749a(14) =522627a(15) =1046616a(16) =2094858a(17) =4191639a(18) =8385533a(19) =16773690a(20) =33550412a(21) =67104305a(22) =134212583a(23) =268429676a(24) =536864446a(25) =1073734619a(26) =2147475649a(27) =4294958446a(28) =8589924832a(29) =17179858453