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 A356255 #17 Jan 16 2023 09:10:46
%S A356255 1,-3,-1,5,3,-2,4,-5,7,-4,6,-7,9,-6,8,-11,13,-8,10,-9,11,-10,12,-15,
%T A356255 -13,18,14,-20,22,-14,16,-23,-19,28,-12,-17,-25,35,15,-18,-36,20,-22,
%U A356255 21,17,-41,93,-31,33,-24,26,-38,40,-26,-16,-39,25,32,30,-29,31,-30,-28,29,-27,61,-133,50,-52,34
%N A356255 a(1) = 1; for n > 1, a(n) is the smallest magnitude number not occurring earlier such that n is divisible by s = Sum_{k = 1..n} a(k), where |s| > 1.
%C A356255 The sequence is finite - after 2020 terms, a(2020) = -669, the sum of all terms is 4 so the next term would have to be 4 less than the divisors with magnitude > 1 of 2021, namely 2017, 43, 39, -47, -51, -2025. However these six numbers have all previously occurred so the sequence terminates.
%H A356255 Scott R. Shannon, <a href="/A356255/b356255.txt">Table of n, a(n) for n = 1..2020</a>
%e A356255 a(7) = 4 as Sum_{k = 1..7} a(k) = 1 - 3 - 1 + 5 + 3 - 2 + 4 = 7, and 4 is the smallest magnitude number not occurring earlier that forms a sum with magnitude > 1 that is a divisor of 7.
%Y A356255 Cf. A019444 (sum of terms is divisible by n), A027749, A027750.
%K A356255 sign,fini,full
%O A356255 1,2
%A A356255 _Scott R. Shannon_, Oct 15 2022