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 A132131 #5 Mar 30 2012 18:34:45 %S A132131 1,13,22,24,33,35,44,46,55,57,66,68,77,79,88,90,100,102,113,124,133, %T A132131 143,153,163,173,183,193,203,224,235,244,254,264,274,284,294,304,335, %U A132131 346,355,365,375,385,395,405,446,457,466,476,486,496,506,557,568,577,587 %N A132131 "Punctual Bird" numbers n with the additional property that n-1 is not a Punctual Bird (cf. A131881). %C A132131 Punctual Birds (A131881) are all numbers k with A132131(n) <= k < A132132(n) for some n Early Birds (A116700) are all numbers k with A132132(n) <= k < A132131(n+1) for some n %H A132131 Graeme McRae, <a href="/A132131/b132131.txt">Table of n, a(n) for n = 1..27348</a> %e A132131 a(1)=1 because 1 is the first Punctual Bird. %e A132131 a(2)=13 because 1-11 are Punctual Birds and 12 is not a Punctual Bird. %e A132131 a(3)=22 because 13-20 are Punctual Birds and 21 is not a Punctual Bird. %Y A132131 Cf. A033307, A117804, A116700, A131881, A132132, A132133. %K A132131 base,nonn %O A132131 1,2 %A A132131 _Graeme McRae_, Aug 11 2007