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 A218128 #13 Nov 01 2024 02:00:49 %S A218128 0,1,7,10,16,34,70,82,88,124,127,160,172,199,217,250,268,340,352,358, %T A218128 379,394,397,442,451,520,538,574,619,622,664,682,700,718,754,775,802, %U A218128 829,844,871,880,970,973,988,1027,1078,1081,1117,1123,1171,1240,1252,1258 %N A218128 a(n) = (A090801(n+2) - 2)/4. %C A218128 a(n) mod 9 appears to be always 1 or 7 (except the first term). Checked for the first 1000 terms. %C A218128 a(n+2) - a(n+1) = 6, 3, 6, 18, 36, 12, 6, 36, 3, 33, 12, 27,... = (A090801(n+4) - A090801(n+3))/4 are multiples of 3. %K A218128 nonn %O A218128 0,3 %A A218128 _Paul Curtz_, Oct 21 2012