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 A376011 #10 Sep 07 2024 16:04:11
%S A376011 0,1,3,19,276,10341,1526969
%N A376011 a(n) = number of solutions (x_1, x_2, ..., x_n) to Product_{i=1..n} (1 + 1/x_i) = 3.
%C A376011 Number of ways 3 is a product of n superparticular ratios, without regard to order. A superparticular ratio is a ratio of the form (m+1)/m.
%e A376011 a(3) = 3 since 3 can be written as (2/1)(4/3)(9/8), (2/1)(5/4)(6/5), or (3/2)^2 (4/3) but in no other way using superparticular ratios.
%Y A376011 Cf. A085098, A118086, A277608.
%K A376011 hard,nonn,more
%O A376011 1,3
%A A376011 _Keith F. Lynch_, Sep 05 2024