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 A274874 #5 Jul 10 2016 14:47:22 %S A274874 1,5,95,475,5294,26470,227294,1136470,8351711,41758555,277114769, %T A274874 1385573845,8568214932,42841074660,251848578952,1259242894760, %U A274874 7132223195725,35661115978625,196428153720067,982140768600335,5296485323226634,26482426616133170 %N A274874 Number of set partitions of [n] into exactly ten blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index. %H A274874 Alois P. Heinz, <a href="/A274874/b274874.txt">Table of n, a(n) for n = 10..1000</a> %F A274874 G.f.: -x^10/((x-1)*(4*x+1)*(3*x-1)*(5*x-1)*(2*x+1)*(2*x-1)*(3*x+1)*(4*x-1)*(x+1)*(12*x^2-1)*(6*x^2-1)*(20*x^2-1)*(2*x^2-1)). %e A274874 a(10) = 1: 1|2|3|4|5|6|7|8|9|(10). %e A274874 a(11) = 5: 1(11)|2|3|4|5|6|7|8|9|(10), 1|2|3(11)|4|5|6|7|8|9|(10), 1|2|3|4|5(11)|6|7|8|9|(10), 1|2|3|4|5|6|7(11)|8|9|(10), 1|2|3|4|5|6|7|8|9(11)|(10). %Y A274874 Column k=10 of A274537. %K A274874 nonn,easy %O A274874 10,2 %A A274874 _Alois P. Heinz_, Jul 09 2016