A005977 - OEIS

%I M1787 #10 Jan 10 2018 03:15:44

%S 0,0,0,0,1,2,7,31,168,1025,7013,52495,425213,3696032,34291937,

%T 338161526,3532185118,38963334652,452704892533,5526901638291,

%U 70746674291507

%N Reduced interval graphs with n nodes.

%D P. J. Hanlon, personal communication.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H Phil Hanlon, <a href="http://dx.doi.org/10.1090/S0002-9947-1982-0662044-8">Counting interval graphs</a>, Trans. Amer. Math. Soc. 272 (1982), no. 2, 383-426.

%K nonn

%O 1,6

%A _N. J. A. Sloane_.