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 A369392 #11 Jan 25 2024 08:03:25
%S A369392 1,1,2,3,5,9,18,32,56,111,211,386,727,1374,2654,5018,9346,17946,33654,
%T A369392 63754,120619,229835,443058,834608,1563645,2999088,5843122,11070802,
%U A369392 21253933,41347141,79197559,153735211,293761934,570421574,1112023166,2153293449
%N A369392 Number of subsets of {2..n} such that the product of the elements plus 1 is a prime.
%e A369392 a(5) = 9 subsets: {}, {2}, {4}, {2, 3}, {2, 5}, {3, 4}, {2, 3, 5}, {2, 4, 5} and {3, 4, 5}.
%Y A369392 Cf. A000040, A127542.
%K A369392 nonn
%O A369392 0,3
%A A369392 _Ilya Gutkovskiy_, Jan 22 2024
%E A369392 a(22)-a(35) from _Alois P. Heinz_, Jan 22 2024