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 A275308 #10 Jul 23 2025 15:40:39 %S A275308 2,1,2,2,2,1,2,2,1,1,2,2,1,2,1,1,2,2,2,2,2,1,2,1,2,2,2,2,1,1,1,2,1,1, %T A275308 2,1,1,2,2,2,2,1,2,2,2,2,2,1,2,1 %N A275308 Starting terms for the second half of the Kolakoski sequence. %C A275308 When building the Kolakoski sequence (A000002) using substitutional generation, this is the first term that comes from the second 2. Or equivalently, this is the first new term added to the previous sequence. %e A275308 . 22 %e A275308 . ^ %e A275308 . 2211 %e A275308 . ^ %e A275308 . 221121 %e A275308 . ^ %e A275308 . 221121221 %e A275308 . ^ %e A275308 . 22112122122112 %e A275308 . ^ %e A275308 To obtain the first 5 terms: 2, 1, 2, 2, 2. %Y A275308 Cf. A000002. %K A275308 nonn,more %O A275308 1,1 %A A275308 _David Spies_, Jul 22 2016