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 A161366 #4 Mar 31 2012 14:00:42 %S A161366 1,4,10,14,21,30,37,50,59,74,88,100,104,116,131,148,167,186,204,220, %T A161366 236,258,282,303,318,338,361,383,406,423,446,472,496,521,540,558,582, %U A161366 603,618,638,661,683,706,721,741,764,789,813,829,851,875,899,923,944,970 %N A161366 Each term is the previous term plus the number of letters in the previous number, as conventionally spelled out in Spanish. %C A161366 1= uno(3 letters), 1+3 = 4 = cuatro (6 letters) 4+6=10, etc %Y A161366 Cf. A060403. %K A161366 nonn,word %O A161366 1,2 %A A161366 _Claudio Meller_, Jun 07 2009