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 A379809 #31 Feb 22 2025 10:43:30 %S A379809 1,11,206,4711,119762,3251262,92306652,2707246767,81383125802, %T A379809 2494303114138,77649809235908,2448551324091158,78045772623110068, %U A379809 2510492897120044508,81392303609900487864,2656907435381578839999,87251781133687146226074,2880554534221668509513154 %N A379809 Coefficient of x^n in (3-sqrt(5+4*sqrt(1-36*x)))/12. %H A379809 David Broadhurst, <a href="https://vimeo.com/1054325156?share=copy">Resurgent Integer Sequences</a>, Rutgers Experimental Math Seminar, Feb 06 2025; <a href="https://sites.math.rutgers.edu/~zeilberg/expmath/broadhurst2025.pdf">Slides</a>. %H A379809 David Broadhurst, <a href="/A379809/a379809.pdf">Resurgent Integer Sequences</a>, Rutgers Experimental Math Seminar, Feb 06 2025, Slide 6. [Local copy, with permission] %F A379809 D-finite with recurrence n*(n-1)*a(n) +14*(n-1)*(2*n-3)*a(n-1) -144*(4*n-7)*(4*n-9)*a(n-2)=0. - _R. J. Mathar_, Feb 18 2025 %o A379809 (PARI) print(Vec((3-sqrt(5+4*sqrt(1-36*x+O(x^19))))/12)); \\ _David Broadhurst_, Feb 17 2025 %Y A379809 Cf. A051862. %K A379809 nonn %O A379809 1,2 %A A379809 _N. J. A. Sloane_, Feb 07 2025 %E A379809 Definition simplified by _David Broadhurst_, Feb 17 2025