Number of irredundant sets in the n-Moebius ladder.

Terms

a(0) =3a(1) =5a(2) =24a(3) =81a(4) =198a(5) =542a(6) =1550a(7) =4497a(8) =12732a(9) =36210a(10) =103579a(11) =296250a(12) =846303a(13) =2417308a(14) =6907329a(15) =19737889a(16) =56396602a(17) =161138306a(18) =460420182a(19) =1315565326a(20) =3758963099a(21) =10740463167a(22) =30688703123a(23) =87686813826a(24) =250547405698a(25) =715888629071