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 A379452 #4 Dec 23 2024 22:06:11 %S A379452 1,0,6,144,8640,1670400,1238655600,6095673521280 %N A379452 Number of compositions (ordered partitions) of 1 into n distinct reciprocals of positive integers. %F A379452 a(n) = n! * A006585(n). %e A379452 a(3) = 6 because we have 1 = 1/2 + 1/3 + 1/6 %e A379452 = 1/2 + 1/6 + 1/3 %e A379452 = 1/3 + 1/2 + 1/6 %e A379452 = 1/3 + 1/6 + 1/2 %e A379452 = 1/6 + 1/2 + 1/3 %e A379452 = 1/6 + 1/3 + 1/2. %Y A379452 Cf. A002966, A002967, A006585. %K A379452 nonn,hard,more %O A379452 1,3 %A A379452 _Ilya Gutkovskiy_, Dec 23 2024