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