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 A319951 #18 Aug 15 2025 15:57:21 %S A319951 0,1,1,2,2,2,3,3,3,4,4,4,4,5,5,5,5,6,6,6,6,6,7,7,7,7,7,8,8,8,8,8,9,9, %T A319951 9,9,9,9,10,10,10,10,10,10,11,11,11,11,11,11,12,12,12,12,12,12,12,13, %U A319951 13,13,13,13,13,13,14,14,14,14,14,14,14,15,15,15,15,15,15,15,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,18,18,18,18,18,18,18,18,19 %N A319951 Take Golomb's sequence A001462 and extend all the runs by 1; prepend an initial 0. %C A319951 Each value of n (n >= 1) appears exactly A001462(n)+1 times. %F A319951 a(n) = A001462(n - A001462(n - A001462(n))) for n >= 3. - _Alan Michael Gómez Calderón_, Aug 14 2025 %e A319951 Golomb's sequence begins 1, 2,2, 3,3, 4,4,4, 5,5,5, ... %e A319951 and we just extend each run by one term, getting 0, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, ... %Y A319951 Cf. A001462, A318921, A319434. %K A319951 nonn %O A319951 0,4 %A A319951 _N. J. A. Sloane_, Oct 02 2018