Number of unlabeled identity connected unit interval graphs with n nodes.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =2a(6) =4a(7) =15a(8) =36a(9) =108a(10) =276a(11) =770a(12) =2036a(13) =5586a(14) =15072a(15) =41370a(16) =113184a(17) =312488a(18) =863824a(19) =2401344a(20) =6692368a(21) =18724990a(22) =52531788a(23) =147824963a(24) =417006316a(25) =1179285900a(26) =3342274092a(27) =9492427854a(28) =27011049612a(29) =76999988534