Number of independent sets of vertices in graph K_3 X C_n (n > 2).

Terms

a(0) =4a(1) =1a(2) =13a(3) =34a(4) =121a(5) =391a(6) =1300a(7) =4285a(8) =14161a(9) =46762a(10) =154453a(11) =510115a(12) =1684804a(13) =5564521a(14) =18378373a(15) =60699634a(16) =200477281a(17) =662131471a(18) =2186871700a(19) =7222746565a(20) =23855111401a(21) =78788080762a(22) =260219353693a(23) =859446141835