Number of independent vertex sets and vertex covers in the n-gear graph.

Terms

a(0) =5a(1) =11a(2) =26a(3) =63a(4) =155a(5) =386a(6) =971a(7) =2463a(8) =6290a(9) =16151a(10) =41651a(11) =107778a(12) =279635a(13) =727031a(14) =1893266a(15) =4936383a(16) =12883115a(17) =33647426a(18) =87928091a(19) =229874703a(20) =601171730a(21) =1572591911a(22) =4114506851a(23) =10766734338a(24) =28177307555a(25) =73748411111a(26) =193034371346a(27) =505287594063