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 A157319 #23 Jun 13 2015 00:53:01 %S A157319 0,3,6,7,9,10,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29, %T A157319 30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52, %U A157319 53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77 %N A157319 Possible total points for a single team in a game of American football, ignoring safeties (and time constraints). %C A157319 Allowing 2-point safeties, the only impossible score is 1, see A087156. (With 1-point safeties all scores are possible.) - _Charles R Greathouse IV_, Jun 10 2015 %H A157319 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A157319 All combinations of sums of multiples of 3, 6, and 7. %o A157319 (PARI) a(n)=if(n<7,[0, 3, 6, 7, 9, 10][n],n+5) \\ _Charles R Greathouse IV_, Sep 02 2011 %Y A157319 Cf. A069745, A020725. %K A157319 nonn,easy %O A157319 1,2 %A A157319 Dan Brown (ddbhockey(AT)hotmail.com), Feb 26 2009 %E A157319 Edited by _N. J. A. Sloane_, Mar 08 2009