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 A060714 #2 Mar 30 2012 17:30:31
%S A060714 1,2,3,5,6,9,11,17,19,30,33,50,55,74,80,99,108,138,155,188,207,257,
%T A060714 276,331,361,441,471,579,609,764,797,985,1018,1225,1275,1551,1601,
%U A060714 1962,2017,2458,2532,2973,3053,3632,3731,4340,4448,5057,5195,5992
%N A060714 a(n) = a(n-1) + a(n-1 minus the number of terms of the same parity as n so far).
%e A060714 a(5) = a(4) + a(4 - the number of odd terms so far) = a(4) + a(4-3) = 5 + 1 = 6.
%t A060714 a[ 1 ] = 1; a[ 2 ] = 2; a[ n_ ] := a[ n ] = Block[ {e = 0}, Do[ If[ EvenQ[ a[ k ] ], e++ ], {k, 1, n - 1} ]; If[ EvenQ[ n ], a[ n - 1 ] + a[ n - 1 - e ], a[ n - 1 ] + a[ e ] ] ]; Table[ a[ n ], {n, 1, 15} ]
%Y A060714 Cf. A006336, A007604.
%K A060714 nonn
%O A060714 1,2
%A A060714 _Robert G. Wilson v_, Apr 21 2001