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 A321245 #23 Feb 12 2021 12:13:19 %S A321245 0,1,1155,759759,103786510,4767856260,107118740001,1465350136810, %T A321245 13956101513964,100946621623995,588405869207695,2882842751900001, %U A321245 12245455022841690,46164185630256694,157281327978056205,491245336843482180,1422828159652548376,3857444027819847045,9864873410828916699,23951146853875652515,55509091777214287590 %N A321245 Non-isomorphic proper colorings of the 4 X 4 grid graph using at most n colors under rotational and reflectional symmetries. %D A321245 F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, 1973. %H A321245 Marko Riedel et al., <a href="https://math.stackexchange.com/questions/2584928/">Tree graphs colorings</a>, Math StackExchange, December 2017. %H A321245 Marko Riedel et al., <a href="https://math.stackexchange.com/questions/2977453/">3-colourings of a 3×3 table with one of 3 colors up to symmetries</a>, Math StackExchange, October 2018. %F A321245 a(n) = (1/8)*n^16 - 3*n^15 + (69/2)*n^14 - (2015/8)*n^13 + (10437/8)*n^12 - (20307/4)*n^11 + 15333*n^10 - (292907/8)*n^9 + (557915/8)*n^8 - (848501/8)*n^7 + (1023195/8)*n^6 - (240539/2)*n^5 + (683997/8)*n^4 - (347485/8)*n^3 + (112831/8)*n^2 - (8807/4)*n. %Y A321245 Cf. A002817, A321244, A321246. %K A321245 nonn %O A321245 1,3 %A A321245 _Marko Riedel_, Nov 01 2018