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 A055262 #5 Jun 03 2015 10:28:42
%S A055262 0,1,3,6,10,6,12,10,9,18,19,21,15,19,24,21,19,27,27,28,30,24,28,33,30,
%T A055262 28,36,36,37,39,42,37,42,39,46,45,45,46,48,51,46,51,48,55,54,54,55,57,
%U A055262 60,55,60,57,64,63,63,64,66,69,73,69,75,73,72,72,73,75,78,82,78,84,82
%N A055262 n + sum of digits of a(n-1).
%H A055262 Harvey P. Dale, <a href="/A055262/b055262.txt">Table of n, a(n) for n = 0..1000</a>
%F A055262 a(n) = n+A055263(n-1) =n+A007953(a(n-1))
%e A055262 a(10)=19 because a(9)=18, 1+8=9 and 10+9=19
%t A055262 nxt[{n_,a_}]:={n+1,Total[IntegerDigits[a]]+n+1}; Transpose[NestList[nxt,{0,0},70]][[2]] (* _Harvey P. Dale_, Jun 03 2015 *)
%Y A055262 Cf. A055263.
%K A055262 base,easy,nonn
%O A055262 0,3
%A A055262 _Henry Bottomley_, May 08 2000