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 A374773 #38 Aug 06 2024 21:34:44
%S A374773 3,8,22,54,135,331,808
%N A374773 a(n):= #G_{2n}(3n+1) for n >= 1, where G_{2n}(3n+1) is the set of all pure (2n)-sparse gapset of genus 3n+1 and n a positive integer.
%H A374773 Gilberto B. Almeida Filho and Matheus Bernardini <a href="https://doi.org/10.1007/s00233-022-10254-w">On pure kappa-sparse gapsets</a>, Semigroup Forum, Vol. 104 (2022), pp. 213-227.
%H A374773 Gilberto Brito and Stéfani Vieira, <a href="https://arxiv.org/abs/2407.21563">A certain sequence on pure kappa-sparse gapsets</a>, arXiv:2407.21563 [math.CO], 2024. See pp. 1-2.
%Y A374773 Cf. A348619.
%K A374773 nonn,hard,more
%O A374773 1,1
%A A374773 _Gilberto Brito de Almeida_, Jul 19 2024