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 A371498 #8 Mar 31 2024 08:44:21
%S A371498 4,1,6,6,3,9,1,0,9,3,4,7,9,2,0,6,2,8,5,0,9,2,5,2,2,0,3,1,8,2,1,5,8,0,
%T A371498 6,3,0,7,7,8,1,3,1,2,6,4,6,7,5,4,3,3,2,0,4,3,6,1,4,5,2,4,9,4,4,9,6,4,
%U A371498 3,7,9,6,1,5,2,3,5,4,3,7,5,6,0,7,9,7
%N A371498 Decimal expansion of Sum_{k>=0} ((-1)^k)/(k^2)!.
%F A371498 (Constant in A371499) - (this constant) = 2.00000551146384...
%e A371498 0.0416639109347920628509252203182...
%t A371498 s[x_] := s[x] = Sum[x^n/((n^2)!), {n, 0, Infinity}]
%t A371498 First[RealDigits[N[s[-1], 100]]]
%o A371498 (PARI) suminf(k=0,((-1)^k)/(k^2)!) \\ _Hugo Pfoertner_, Mar 30 2024
%Y A371498 Cf. A371499.
%K A371498 nonn,cons
%O A371498 0,1
%A A371498 _Clark Kimberling_, Mar 30 2024