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 A185177 #23 Mar 06 2015 01:16:02 %S A185177 6,9,12,13,17,18,20,24,25,26,27,30,31,32,33,34,35,36,37,38,39,40,41,42 %N A185177 Different values of the permanent in (0,1) quadratic matrices with exactly 3 ones in each row and each column, in the increasing order. %C A185177 The sequence contains all different terms of A185179 in increasing order. %D A185177 V. I. Bolshakov, On spectrum of permanent on Lambda_n^k, Proc. of Seminar on Discrete Math. and Appl., Moscow State Univ. (1986), 65-73 (in Russian). %H A185177 V. S. Shevelev, <a href="http://dx.doi.org/10.1007/BF01104103">Some problems of the theory of enumerating the permutations with restricted position</a>, Journal of Soviet Mathematics, 61 (4) (1992) 2272-2317 (see pp.2307-2309). %Y A185177 Cf. A176211, A176212, A185178, A185179. %K A185177 nonn,more %O A185177 1,1 %A A185177 _Vladimir Shevelev_, Feb 19 2011