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 A350968 #9 Mar 03 2022 12:54:19 %S A350968 4,499,54940,6042955,664670164,73107675139,8041179595180, %T A350968 884456647794715,97282190077823524,10700156451912792979, %U A350968 1176919927520329404220,129450491870784321671275,14238377185858755054436084,1566092039952592271666298019,172255886017599291128238346060 %N A350968 a(n) = (A350967(n)-1)/2. %D A350968 E.-A. Majol, Note #2228, L'Intermédiaire des Mathématiciens, 9 (1902), pp. 183-185. %Y A350968 Cf. A144930, A350967. %K A350968 nonn %O A350968 1,1 %A A350968 _N. J. A. Sloane_, Mar 03 2022