Number of maximal independent vertex sets (and minimal vertex covers) in the n-web graph.

Terms

a(0) =0a(1) =4a(2) =9a(3) =12a(4) =30a(5) =55a(6) =105a(7) =212a(8) =405a(9) =794a(10) =1551a(11) =3015a(12) =5889a(13) =11477a(14) =22374a(15) =43636a(16) =85068a(17) =165871a(18) =323418a(19) =630582a(20) =1229517a(21) =2397289a(22) =4674198a(23) =9113711a(24) =17769780a(25) =34647305a(26) =67554891a(27) =131717661a(28) =256821477a(29) =500747300