This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A079442 #17 Jan 11 2024 13:06:32 %S A079442 1,1,0,3,0,9,0,21,0,45,0,99,0,195,0,399,0,801,0 %N A079442 Number of fixed points in range [A014137(n-1)..A014138(n)] of permutation A071663. %H A079442 R. Donaghey, <a href="https://doi.org/10.1016/0095-8956(80)90045-3">Automorphisms on Catalan trees and bracketing</a>, J. Combin. Theory, Series B, 29 (1980), 75-90. %H A079442 Antti Karttunen, <a href="/A089408/a089408.c.txt">C-program for counting the initial terms of this sequence</a> %H A079442 Antti Karttunen, <a href="/A079442/a079442.pdf">Illustration of initial terms for trees of sizes n=3..11</a> %F A079442 For all n >= 0, a(2n+3)/3 = A079444(n). %Y A079442 Cf. A057505, A071663, A079438, A079441, A079443, A079444. %Y A079442 Occurs in A073202 as row 176609070820803. %K A079442 nonn,more,hard %O A079442 0,4 %A A079442 _Antti Karttunen_, Jan 27 2003 %E A079442 Name corrected by _Antti Karttunen_, Dec 13 2017