%I

%S 1,1,5,16,55,235,1102,5757,33251

%N Number of types of lambda-terms of term size n.

%H P. Tarau, <a href="http://arxiv.org/abs/1507.06944">A Logic Programming Playground for Lambda Terms, Combinators, Types and Tree-based Arithmetic Computations</a>, arXiv preprint arXiv:1507.06944 [cs.LO], 2015.

%Y Cf. A220471.

%K nonn,more

%O 1,3

%A _N. J. A. Sloane_, Jan 30 2016