Number of independent vertex sets in the n-prism graph Y_n = K_2 X C_n (n > 2).

Terms

a(0) =3a(1) =1a(2) =7a(3) =13a(4) =35a(5) =81a(6) =199a(7) =477a(8) =1155a(9) =2785a(10) =6727a(11) =16237a(12) =39203a(13) =94641a(14) =228487a(15) =551613a(16) =1331715a(17) =3215041a(18) =7761799a(19) =18738637a(20) =45239075a(21) =109216785a(22) =263672647a(23) =636562077a(24) =1536796803a(25) =3710155681a(26) =8957108167a(27) =21624372013a(28) =52205852195