cp's OEIS Frontend

A246323 Triangle read by rows: T(n,k) = number of normal planar lambda terms of size n with k free variables (n >= 1, 1 <= k <= n).

%I A246323 #8 Apr 23 2015 12:32:29
%S A246323 1,2,1,9,6,2,54,40,20,5,378,295,175,70,14,2916,2346,1526,756,252,42,
%T A246323 24057,19739,13587,7602,3234,924,132,208494,173426,123978,74964,36828,
%U A246323 13728,3432,429
%N A246323 Triangle read by rows: T(n,k) = number of normal planar lambda terms of size n with k free variables (n >= 1, 1 <= k <= n).
%H A246323 Noam Zeilberger, Alain Giorgetti, <a href="http://arxiv.org/abs/1408.5028">A correspondence between rooted planar maps and normal planar lambda terms</a>, arXiv:1408.5028 [cs.LO], 2014.
%e A246323 Triangle begins:
%e A246323 1
%e A246323 2,1
%e A246323 9,6,2
%e A246323 54,40,20,5
%e A246323 378,295,175,70,14
%e A246323 2916,2346,1526,756,252,42
%e A246323 24057,19739,13587,7602,3234,924,132,
%e A246323 208494,173426,123978,74964,36828,13728,3432,429
%e A246323 ...
%Y A246323 Cf. A000108, A000984, A000168, A246322.
%K A246323 nonn,tabl
%O A246323 1,2
%A A246323 _N. J. A. Sloane_, Aug 28 2014