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 A218488 #22 Dec 03 2012 11:42:09 %S A218488 60480,2851200,13366080,42134400,93139200,588107520,684391680, %T A218488 1210809600,10534043520,16817673600,38694427200,52143537600, %U A218488 54939044160,59580892800,89555155200,104432328000,136734998400,356676566400,663924381120,1100581171200,1200474475200 %N A218488 Positive numbers differing from next 4 greater squares by squares. %H A218488 Donovan Johnson, <a href="/A218488/b218488.txt">Table of n, a(n) for n = 1..84</a> (terms < 10^18) %H A218488 E. J. Barbeau, <a href="http://dx.doi.org/10.4153/CMB-1985-040-9">Numbers differing from consecutive squares by squares</a>, Canad. Math. Bull. 28(1985), pp. 337-342. %e A218488 60480 = 246^2 - 6^2 = 247^2 - 23^2 = 248^2 - 32^2 = 249^2 - 39^2. %Y A218488 Cf. A218485, A218486, A218487. %K A218488 nonn %O A218488 1,1 %A A218488 _Michel Marcus_, Oct 30 2012 %E A218488 a(9)-a(21) from _Donovan Johnson_, Oct 31 2012