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 A183050 #8 May 04 2014 16:53:59 %S A183050 0,3,4,5,10,15,18,23,32,37,46,57,62,75,90,95,110,129,136,153,174,183, %T A183050 204,227,236,261,288,297,324,355,366,395,428,441,474,509,522,559,598, %U A183050 611,650,693,708,749,794,811,856,903,920,969,1020 %N A183050 Sums of knight's moves to points as in A183049. %F A183050 See A065775. %F A183050 Empirical g.f.: x*(2*x^12-2*x^11+2*x^10-4*x^9+2*x^8-x^7-x^6-4*x^4-4*x^2-x-3) / ((x-1)^3*(x^2+1)*(x^2+x+1)^2). - _Colin Barker_, May 04 2014 %e A183050 a(3)=5=3+1+1, these summands being the least numbers of knight's moves from (0,0) to the points (3,0), (2,1), (1,2) on the 3rd diagonal in the 1st quadrant - which is 1/4 of a 3rd concentric square about the origin. See A183052 for sums over the concentric squares. %Y A183050 Cf. A065775, A183049, A183051. %K A183050 nonn %O A183050 0,2 %A A183050 _Clark Kimberling_, Dec 22 2010