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 A004345 #13 Mar 19 2025 09:04:13
%S A004345 1,20,300,4060,52360,658008,8145060,99884400,1217566350,14783142660,
%T A004345 179013799328,2163842859360,26123889412400,315136287090800,
%U A004345 3799541229226200,45795673964460816,551876736990451095
%N A004345 Binomial coefficient C(5n,n-3).
%D A004345 M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 828.
%H A004345 M. Abramowitz and I. A. Stegun, eds., <a href="http://www.convertit.com/Go/ConvertIt/Reference/AMS55.ASP">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
%F A004345 D-finite with recurrence -8*(4*n+3)*(n-3)*(2*n+1)*(4*n+1)*a(n) +5*(5*n-4)*(5*n-3)*(5*n-2)*(5*n-1)*a(n-1)=0. - _R. J. Mathar_, Mar 19 2025
%t A004345 Table[Binomial[5n,n-3],{n,3,20}] (* _Harvey P. Dale_, Feb 13 2013 *)
%K A004345 nonn,easy
%O A004345 3,2
%A A004345 _N. J. A. Sloane_