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 A131448 #11 Jan 28 2025 08:37:57
%S A131448 1,2,2,24,40,144,5040,40320,6048,6048,19958400,53222400,53222400,
%T A131448 87178291200,118879488000,5230697472000,8083805184000,
%U A131448 3201186852864000,40548366802944000,2432902008176640000,17030314057236480000
%N A131448 Denominators of n-th approximation of factorial (also called harmonic) expansion of Euler's constant gamma (A001620).
%C A131448 For the Havil reference and a W. Lang link see A131447.
%F A131448 a(n) = denominator(r(n)), with r(n) = Sum_{k=1..n} b(k)/k!, and b(k) = A096622(k) (factorial expansion of gamma).
%e A131448 Rationals r(n): [0, 1/2, 1/2, 13/24, 23/40, 83/144, 2909/5040, 23273/40320, 3491/6048, ...]
%Y A131448 Cf. A001620, A096622, A131447 (numerators).
%K A131448 nonn,frac,easy
%O A131448 1,2
%A A131448 _Wolfdieter Lang_, Aug 07 2007