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 A383542 #21 May 10 2025 23:00:16 %S A383542 0,1,3,5,10,20,43,96,220,519,1246,3036,7480,18599,46596,117478,297780, %T A383542 758319,1938952,4975454,12807826,33063593,85572336,221983185, %U A383542 577057696,1502975453,3921470496,10248248560,26822559296,70299597879,184486604704,484727787984 %N A383542 a(n) = round(Shi(n)) where Shi(x) is the sinh integral function. %C A383542 This sequence is almost the same as A383692, except at n = 0, where Chi(0) is undefined, and at n = 2, where Shi(2) = 2.50156... rounds to 3, while Chi(2) = 2.45266... rounds to 2. %t A383542 a[n_]:=Round[SinhIntegral[n]]; Array[a,31] %Y A383542 Cf. A383692. %K A383542 nonn %O A383542 0,3 %A A383542 _Kritsada Moomuang_, May 05 2025