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 A072925 #21 Jun 03 2019 03:15:10 %S A072925 1,1,1,2,4,8,17,36,78,171,379,888,1944 %N A072925 Probably an erroneous version of A002845. %C A072925 The old entry with this sequence number was a duplicate of A037444. %D A072925 J. Q. Longyear, personal communication. %D A072925 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences. San Diego, CA: Academic Press, 1995; entry M1139. %H A072925 F. Goebel and R. P. Nederpelt, <a href="http://www.jstor.org/stable/2316312">The number of numerical outcomes of iterated powers</a>, Amer. Math. Monthly, 80 (1971), 1097-1103. %H A072925 R. K. Guy and J. L. Selfridge, <a href="http://www.jstor.org/stable/2319392">The nesting and roosting habits of the laddered parenthesis</a>, Amer. Math. Monthly 80 (8) (1973), 868-876. %H A072925 J. Longyear, T. Trotter, N. J. A. Sloane, <a href="/A005321/a005321_2.pdf">Correspondence</a> %K A072925 dead %O A072925 1,4