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 A064776 #7 Oct 19 2017 03:13:56 %S A064776 2,3,3,5,21,24,24,80,80,80,480,480,720,1200,2000,8400,9600,9600,32000, %T A064776 32000,32000,192000,192000,288000,480000,800000,3360000,3840000, %U A064776 3840000,12800000,12800000,12800000,76800000,76800000,115200000,192000000 %N A064776 a(n) is smallest number >= a(n-1) such that a(n) plus any set of the previous values of the sequence is a nonsquare. %C A064776 Why do so many terms end with a string of zeros? - Zak Seidov, Jan 01 2008 %e A064776 a(3) = 3 because possible sums are 3, 3+a(1), 3+a(2), 3+a(1)+a(2) = 3, 3+2, 3+3, 3+2+3 = 3,5,6,8, all of which are nonsquares. %Y A064776 Cf. A133662. %Y A064776 Cf. A133662. %K A064776 nonn %O A064776 1,1 %A A064776 Jonathan Ayres (jonathan.ayres(AT)btinternet.com), Oct 18 2001 %E A064776 More terms from Larry Reeves (larryr(AT)acm.org), Oct 10 2003 %E A064776 More terms and better definition from _Don Reble_, Jan 01 2008