Number of mutual-visibility sets in the n-sunlet graph.

Terms

a(0) =1a(1) =4a(2) =11a(3) =30a(4) =78a(5) =137a(6) =327a(7) =499a(8) =1124a(9) =1640a(10) =3559a(11) =5194a(12) =10994a(13) =16499a(14) =34311a(15) =53893a(16) =110632a(17) =183330a(18) =372823a(19) =650828a(20) =1314966a(21) =2398341a(22) =4825319a(23) =9095375a(24) =18252108a(25) =35193132a(26) =70517191a(27) =137978270a(28) =276234842a(29) =545423911