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 A080787 #6 Mar 30 2012 18:39:16 %S A080787 1,1,2,3,5,8,13,21,24,25,29,34,43,47,50,57,57,64,71,75,76,81,87,88,95, %T A080787 103,108,111,119,120,129,129,138,147,155,162,167,169,176,185,191,196, %U A080787 197,203,210,213,213,216,219,225,234,239,243,252,255,257,262,269,271 %N A080787 a(1)=a(2)=1; a(n) = a(n-1) + last decimal digit of a(n-2). %F A080787 a(n)=a(n-1)+a(n-2)(mod 10); for n>=3 a(n)-a(n-1)=A003893(n-2)=A000045(n-2)(mod 10) %K A080787 base,nonn %O A080787 1,3 %A A080787 _Benoit Cloitre_, Mar 12 2003