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 A068248 #12 May 03 2012 16:47:57 %S A068248 1,673072,24674450670,47695073906240,16222886703881375, %T A068248 1842996310592836896,98798502888215704812,3068393794369671728640, %U A068248 62960689505171989129005,933100312771109288146000,10639781342848431789710266,97779035987698387480546752,750090455960001686602653035 %N A068248 1/6 the number of colorings of a 5 X 5 staggered hexagonal array with n colors. %H A068248 Alois P. Heinz, <a href="/A068248/b068248.txt">Table of n, a(n) for n = 3..1000</a> %H A068248 Alois P. Heinz, <a href="/A068248/a068248.txt">Formula for A068248</a> %p A068248 a:= n-> (3006792824+ (-26845691044+ (115537440058+ (-319333174471+ (636781496832+ (-975359012827+ (1192518013138+ (-1193724499144+ (995462037353+ (-699932345254+ (418375639535+ (-213720396671+ (93568819963+ (-35133625647+ (11298632584+ %p A068248 (-3101089710+ (722137763+ (-141421592+ (23000726+ (-3051871+ (321994+ (-25992+ (1508+(-56+n)*n) *n)*n) *n)*n) *n)*n) *n)*n) *n)*n) *n)*n) *n) *n) *n) *n) *n) *n) *n) *n) *n) *n) *n/6: %p A068248 seq (a(n), n=3..40); # _Alois P. Heinz_, May 03 2012 %Y A068248 Cf. A068239-A068305, A000332, A002417, A027441, A212194, A212195. %K A068248 nonn %O A068248 3,2 %A A068248 _R. H. Hardin_, Feb 24 2002 %E A068248 Extended beyond a(10) by _Alois P. Heinz_, May 03 2012