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 A080293 #5 Jan 11 2024 09:24:07 %S A080293 2,50,14642,3969842,267572689202,69427226972978,4581045692538239282, %T A080293 301220569271221714981682,1295918094920364850246919050705202, %U A080293 332029112115571675270693117549056818 %N A080293 A014486-encoding of the branch-reduced binomial-mod-2 binary trees. %C A080293 These are obtained from the stunted binomial-mod-2 zigzag trees (A080263) either by extending each leaf to a branch of two leaves, or by branch-reducing every other such tree. %F A080293 a(n) = A080310(A080263(n)) = A014486(A080298(A080265(n))) = A014486(A080979(A080265(2*n))) %Y A080293 a(n) = A014486(A080295(n)). Same sequence in binary: A080294. Breadth-first-wise encoding: A080318. "Moose-trees" obtained from these: A080973. Cf. A080292, A080297. %K A080293 nonn %O A080293 0,1 %A A080293 _Antti Karttunen_, Mar 02 2003