A057548 - OEIS

%I #9 Aug 03 2017 00:39:15

%S 1,3,7,8,17,18,20,21,22,45,46,48,49,50,54,55,57,58,59,61,62,63,64,129,

%T 130,132,133,134,138,139,141,142,143,145,146,147,148,157,158,160,161,

%U 162,166,167,169,170,171,173,174,175,176,180,181,183,184,185,187,188

%N A014486-indices of Catalan mountain ranges with no sea-level valleys, i.e., the rooted plane general trees with root degree = 1.

%C This sequence is induced by the unary form of function 'list' (present in Lisp and Scheme) when it acts on symbolless S-expressions encoded by A014486/A063171.

%H <a href="/index/Li#ListFunsOfLisp">Index entries for the sequences induced by list functions of Lisp</a>

%F a(n) = A080300(A057547(n)) = A069770(A072795(n)).

%Y We have A057515(A057548(n)) = 1 for all n. Row 0 of A072764. Column 1 of A085203. Cf. A057517, A057549, A057551.

%K nonn

%O 0,2

%A _Antti Karttunen_, Sep 07 2000