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 A081731 #9 May 03 2025 07:45:53 %S A081731 1,23,841,45023,3321841,323146823,40078005241,6172529945423, %T A081731 1155774491891041,258569396539480823,68116719340312179241, %U A081731 20870735447824438473023,7358996769608563523829841,2958635655331631430113322023,1345380961533244150651061562841,687031380335435376384294050107823 %N A081731 a(n) = (A000364(n+2)-A000364(n))/60. %t A081731 a[n_] := (Abs[EulerE[2*n+4]] - Abs[EulerE[2*n]]) / 60; Array[a, 16] (* _Amiram Eldar_, May 03 2025 *) %o A081731 (PARI) a(n) = (abs(eulerfrac(2*n+4)) - abs(eulerfrac(2*n))) / 60; \\ _Amiram Eldar_, May 03 2025 %Y A081731 Cf. A000364, A060075. %K A081731 nonn %O A081731 1,2 %A A081731 _Benoit Cloitre_, Apr 06 2003