Number of irredundant sets in the path graph P_n.

Terms

a(0) =2a(1) =3a(2) =5a(3) =9a(4) =15a(5) =26a(6) =44a(7) =76a(8) =130a(9) =223a(10) =382a(11) =655a(12) =1123a(13) =1925a(14) =3300a(15) =5657a(16) =9698a(17) =16625a(18) =28500a(19) =48857a(20) =83755a(21) =143580a(22) =246137a(23) =421949a(24) =723341a(25) =1240013a(26) =2125736a(27) =3644118a(28) =6247058a(29) =10709240