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 A210428 #17 Feb 08 2017 19:19:38 %S A210428 0,1,16,119,560,1955,5552,13573,29632,59229,110320,193963,325040, %T A210428 523055,813008,1226345,1801984,2587417,3639888,5027647,6831280, %U A210428 9145115,12078704,15758381,20328896,25955125,32823856,41145651,51156784,63121255,77332880,94117457 %N A210428 Number of semistandard Young tableaux over all partitions of 6 with maximal element <= n. %C A210428 a(n) is the number of semistandard Young tableaux over all partitions of 6 with maximal element <= n. %H A210428 Bruno Berselli, <a href="/A210428/b210428.txt">Table of n, a(n) for n = 0..1000</a> %H A210428 Wikipedia, <a href="https://en.wikipedia.org/wiki/Young_tableau">Young tableau</a> %H A210428 <a href="/index/Rec#order_07">Index entries for linear recurrences with constant coefficients</a>, signature (7,-21,35,-35,21,-7,1). %F A210428 a(n) = n^2*(76+(85+19*n^2)*n^2)/180. %F A210428 G.f.: -x*(x+1)*(x^4+8*x^3+20*x^2+8*x+1)/(x-1)^7. %p A210428 a:= n-> n^2*(76+(85+19*n^2)*n^2)/180: %p A210428 seq(a(n), n=0..40); %Y A210428 Row n=6 of A210391. %K A210428 nonn,easy %O A210428 0,3 %A A210428 _Alois P. Heinz_, Mar 21 2012