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 A097699 #6 Apr 24 2020 11:48:22 %S A097699 2,3,4,6,10,15,20,21,50,105,175,196,490,887,1176,3490 %N A097699 Records in the numbers of antichains in the divisor lattice D(n) (A096827). %C A097699 The divisor lattice D(n) is the lattice of the divisors of the natural number n. This sequence counts the empty set as an antichain. %Y A097699 Cf. A096827. %K A097699 nonn,more %O A097699 1,1 %A A097699 _John W. Layman_, Aug 20 2004