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 A183529 #14 May 02 2017 15:33:48 %S A183529 1,2,3,4,5,6,21,36,37,38,39,40,41,51,61,66,284,285,289,290,297,298, %T A183529 299,310,312,559,561,562,570,571,574,575,834,836,837,838,839,840,841, %U A183529 849,850,1109,1124,1125,1126,1127,1386,1401,1402,1661,1676,1677,1936,1951 %N A183529 An Ulam-type sequence: a(n) = n if n<=6; for n>6, a(n) = least number > a(n-1) which is a unique sum of 6 distinct earlier terms. %C A183529 An Ulam-type sequence - see A002858 for further information. %H A183529 Alois P. Heinz, <a href="/A183529/b183529.txt">Table of n, a(n) for n = 1..700</a> %H A183529 <a href="/index/U#Ulam_num">Index entries for Ulam numbers</a> %e A183529 a(7) = 21 = 1 + ... + 6 = 6*7/2, because it is the least number >6 with a unique sum of 6 distinct earlier terms. %e A183529 a(8) = 36 = 1 + ... + 5 + 21 = 6^2, because it is the least number >21 with a unique sum of 6 distinct earlier terms. %p A183529 # see A183534 for programs. %Y A183529 Column k=6 of A183534. %Y A183529 Cf. A002858, A007086, A183527-A183533, A135737. %K A183529 nonn %O A183529 1,2 %A A183529 _Jonathan Vos Post_ and _Alois P. Heinz_, Jan 05 2011